Pick Doubao Seed 2.0 Pro for powers china's most-used consumer ai app, with strong multimodal reasoning or native video understanding alongside text and image input. Pick Fugu Ultra v2.0 for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark or claims to outperform flagship models like gpt-6 astra and claude fable 5.1 despite its underlying orchestration pool reportedly excluding both of them. On a tight budget at scale, Doubao Seed 2.0 Pro is the value pick.
Doubao Seed 2.0 Pro (ByteDance) and Fugu Ultra v2.0 (Sakana AI) are two of the models people most often weigh against each other in 2026. Doubao Seed 2.0 Pro is byteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals. Fugu Ultra v2.0 is sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens. They diverge most on price and context window — each quantified below from the models' real specs.
Key differences
Price: Doubao Seed 2.0 Pro is about 11× cheaper on input ($0.47/$2.37 per 1M tokens vs $5/$30 per 1M tokens) — a large enough gap that at scale it can be the single biggest line item in the decision.
Context window: Fugu Ultra v2.0 holds 3.9× more — 1M tokens (~1,500 pages) vs 256K (~384 pages). But effective recall usually fades long before the advertised ceiling, so the bigger number only helps if the model reasons over it.
Recency: Fugu Ultra v2.0 is the newer model by about 7 months (released September 10, 2026), usually meaning fresher training data and capabilities.
Specifications
Spec
Doubao Seed 2.0 Pro
Fugu Ultra v2.0
Provider
ByteDance (China)
Sakana AI (Global)
Released
February 14, 2026
September 10, 2026
Context window
256K (~384 pages)
1M tokens (~1,500 pages)
Price (in/out)
$0.47/$2.37 per 1M tokens
$5/$30 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, video, code
text
SWE-Bench Verified
Not published
Not published
MRCR v2 @ 1M
Not published
Not published
Who wins what
Powers China's most-used consumer AI app, with strong multimodal reasoning: Doubao Seed 2.0 Pro — ByteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals — and it runs cheaper at $0.47/$2.37 per 1M tokens.
Native video understanding alongside text and image input: Doubao Seed 2.0 Pro — Doubao Seed 2.0 Pro lists native video understanding alongside text and image input among its strengths; Fugu Ultra v2.0 does not.
Aggressively cheap for its claimed capability — around $0.47/$2.37 per million tokens: Doubao Seed 2.0 Pro — At $0.47/$2.37 per 1M tokens it undercuts Fugu Ultra v2.0 ($5/$30 per 1M tokens), and that gap compounds at volume.
Sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the DeepSWE coding-repair benchmark: Fugu Ultra v2.0 — Doubao Seed 2.0 Pro is comparatively weak here — benchmark scores are vendor-claimed; no independent Artificial Analysis index for the Pro variant yet
Claims to outperform flagship models like GPT-6 Astra and Claude Fable 5.1 despite its underlying orchestration pool reportedly excluding both of them: Fugu Ultra v2.0 — Sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens — and it carries the larger 1M tokens context.
1M-token context window: Fugu Ultra v2.0 — Its 1M tokens window holds about 3.9× more than Doubao Seed 2.0 Pro's 256K in a single prompt.
Lowest cost at scale: Doubao Seed 2.0 Pro — At $0.47/$2.37 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Largest single-prompt input: Fugu Ultra v2.0 — Its 1M tokens window is about 3.9× larger than Doubao Seed 2.0 Pro's 256K, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume: Doubao Seed 2.0 Pro — At $0.47/$2.37 per 1M tokens it undercuts Fugu Ultra v2.0, and on millions of tokens that margin decides the monthly bill.
Someone analysing very long documents or codebases: Fugu Ultra v2.0 — Larger 1M tokens window fits more in one prompt.
Anyone whose priority is powers china's most-used consumer ai app, with strong multimodal reasoning: Doubao Seed 2.0 Pro — It is specifically built for that.
Anyone whose priority is sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark: Fugu Ultra v2.0 — That is its strongest area.
Doubao Seed 2.0 Pro: where it fits
ByteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals. Released February 14, 2026 by ByteDance, it is built for powers China's most-used consumer AI app, with strong multimodal reasoning, native video understanding alongside text and image input, aggressively cheap for its claimed capability — around $0.47/$2.37 per million tokens, and byteDance reports frontier-level math and coding scores (e.g. AIME25 98.3, vendor-claimed SWE-Bench Verified 76.5).
Its trade-offs are real: byteDance discloses no parameter count or architecture details, benchmark scores are vendor-claimed; no independent Artificial Analysis index for the Pro variant yet, closed weights on a China-hosted API — data-privacy considerations for sensitive work, and smaller 256K context than the 1M-token Chinese rivals. At $0.47 in / $2.37 out per million tokens, it sits in the budget price band.
Fugu Ultra v2.0: where it fits
Sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens. Released September 10, 2026 by Sakana AI, it is built for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the DeepSWE coding-repair benchmark, claims to outperform flagship models like GPT-6 Astra and Claude Fable 5.1 despite its underlying orchestration pool reportedly excluding both of them, and 1M-token context window.
Its trade-offs: not a single trained model — Sakana describes Fugu as "a Multi-Agent System, Delivered as One Model" that dynamically routes tasks across a pool of other models, so head-to-head benchmark framing against monolithic frontier models should be read skeptically, pricing rises to roughly $10/$45 per million tokens for prompts above 272K tokens, and benchmark comparisons against GPT-6 Astra and Claude Fable 5.1 are Sakana's own self-reported figures, not independently verified head-to-head scores. At $5 in / $30 out per million tokens, it sits in the premium price band.
The bottom line for this matchup
Doubao Seed 2.0 Pro and Fugu Ultra v2.0 overlap enough that the right pick depends on your specific job. Doubao Seed 2.0 Pro costs less per token; Fugu Ultra v2.0 holds the larger context; and each leads in its own area — Doubao Seed 2.0 Pro for powers china's most-used consumer ai app, with strong multimodal reasoning, Fugu Ultra v2.0 for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark. Rather than crowning one, run the same hard task through both once and let the results decide.
Frequently asked questions
Is Doubao Seed 2.0 Pro or Fugu Ultra v2.0 better for coding?
Public SWE-Bench figures are not available for either model, so the honest test is your own repository — run an identical real bug through both. By design, Doubao Seed 2.0 Pro leans toward powers china's most-used consumer ai app, with strong multimodal reasoning while Fugu Ultra v2.0 leans toward sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Doubao Seed 2.0 Pro or Fugu Ultra v2.0?
Doubao Seed 2.0 Pro is cheaper — $0.47/$2.37 per 1M tokens vs $5/$30 per 1M tokens, roughly 11× apart on input.
Which has the bigger context window?
Fugu Ultra v2.0 — 1M tokens vs 256K, about 3.9× larger. Useful only if the model actually reasons over the full window, which not all do.
Can I use both Doubao Seed 2.0 Pro and Fugu Ultra v2.0 together?
Yes — a multi-model platform like LumiChats gives you Doubao Seed 2.0 Pro, Fugu Ultra v2.0 and 40+ others under one ₹69/day pass (about $1/day), so you can draft with one and cross-check with the other instead of buying two subscriptions.
Which is newer, Doubao Seed 2.0 Pro or Fugu Ultra v2.0?
Fugu Ultra v2.0 — released September 10, 2026, about 7 months after Doubao Seed 2.0 Pro.
Doubao Seed 2.0 Pro vs Fugu Ultra v2.0
ByteDance · China | Sakana AI · Global · Updated June 2026
Quick verdict
Pick Doubao Seed 2.0 Pro for powers china's most-used consumer ai app, with strong multimodal reasoning or native video understanding alongside text and image input. Pick Fugu Ultra v2.0 for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark or claims to outperform flagship models like gpt-6 astra and claude fable 5.1 despite its underlying orchestration pool reportedly excluding both of them. On a tight budget at scale, Doubao Seed 2.0 Pro is the value pick.
Doubao Seed 2.0 Pro (ByteDance) and Fugu Ultra v2.0 (Sakana AI) are two of the models people most often weigh against each other in 2026. Doubao Seed 2.0 Pro is byteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals. Fugu Ultra v2.0 is sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens. They diverge most on price and context window — each quantified below from the models' real specs.
Key differences at a glance
▸Price: Doubao Seed 2.0 Pro is about 11× cheaper on input ($0.47/$2.37 per 1M tokens vs $5/$30 per 1M tokens) — a large enough gap that at scale it can be the single biggest line item in the decision.
▸Context window: Fugu Ultra v2.0 holds 3.9× more — 1M tokens (~1,500 pages) vs 256K (~384 pages). But effective recall usually fades long before the advertised ceiling, so the bigger number only helps if the model reasons over it.
▸Recency: Fugu Ultra v2.0 is the newer model by about 7 months (released September 10, 2026), usually meaning fresher training data and capabilities.
Side-by-side specs
Spec
Doubao Seed 2.0 Pro
Fugu Ultra v2.0
Provider
ByteDance (China)
Sakana AI (Global)
Released
February 14, 2026
September 10, 2026
Context window
256K (~384 pages)
1M tokens (~1,500 pages)
Price (in/out)
$0.47/$2.37 per 1M tokens
$5/$30 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, video, code
text
SWE-Bench Verified
Not published
Not published
MRCR v2 @ 1M
Not published
Not published
Who wins what
Powers China's most-used consumer AI app, with strong multimodal reasoning
Doubao Seed 2.0 Pro
ByteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals — and it runs cheaper at $0.47/$2.37 per 1M tokens.
Native video understanding alongside text and image input
Doubao Seed 2.0 Pro
Doubao Seed 2.0 Pro lists native video understanding alongside text and image input among its strengths; Fugu Ultra v2.0 does not.
Aggressively cheap for its claimed capability — around $0.47/$2.37 per million tokens
Doubao Seed 2.0 Pro
At $0.47/$2.37 per 1M tokens it undercuts Fugu Ultra v2.0 ($5/$30 per 1M tokens), and that gap compounds at volume.
Sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the DeepSWE coding-repair benchmark
Fugu Ultra v2.0
Doubao Seed 2.0 Pro is comparatively weak here — benchmark scores are vendor-claimed; no independent Artificial Analysis index for the Pro variant yet
Claims to outperform flagship models like GPT-6 Astra and Claude Fable 5.1 despite its underlying orchestration pool reportedly excluding both of them
Fugu Ultra v2.0
Sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens — and it carries the larger 1M tokens context.
1M-token context window
Fugu Ultra v2.0
Its 1M tokens window holds about 3.9× more than Doubao Seed 2.0 Pro's 256K in a single prompt.
Lowest cost at scale
Doubao Seed 2.0 Pro
At $0.47/$2.37 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Largest single-prompt input
Fugu Ultra v2.0
Its 1M tokens window is about 3.9× larger than Doubao Seed 2.0 Pro's 256K, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume
→ Doubao Seed 2.0 Pro
At $0.47/$2.37 per 1M tokens it undercuts Fugu Ultra v2.0, and on millions of tokens that margin decides the monthly bill.
Someone analysing very long documents or codebases
→ Fugu Ultra v2.0
Larger 1M tokens window fits more in one prompt.
Anyone whose priority is powers china's most-used consumer ai app, with strong multimodal reasoning
→ Doubao Seed 2.0 Pro
It is specifically built for that.
Anyone whose priority is sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark
→ Fugu Ultra v2.0
That is its strongest area.
Doubao Seed 2.0 Pro: where it fits
ByteDance's flagship Doubao model — a cheap, multimodal reasoning model behind China's most popular AI app, with strong vendor-claimed benchmarks but undisclosed internals. Released February 14, 2026 by ByteDance, it is built for powers China's most-used consumer AI app, with strong multimodal reasoning, native video understanding alongside text and image input, aggressively cheap for its claimed capability — around $0.47/$2.37 per million tokens, and byteDance reports frontier-level math and coding scores (e.g. AIME25 98.3, vendor-claimed SWE-Bench Verified 76.5).
Its trade-offs are real: byteDance discloses no parameter count or architecture details, benchmark scores are vendor-claimed; no independent Artificial Analysis index for the Pro variant yet, closed weights on a China-hosted API — data-privacy considerations for sensitive work, and smaller 256K context than the 1M-token Chinese rivals. At $0.47 in / $2.37 out per million tokens, it sits in the budget price band.
Fugu Ultra v2.0: where it fits
Sakana AI's flagship multi-agent orchestration model, claiming best-or-joint-best results on 5 of 8 self-reported benchmarks against monolithic frontier models — $5/$30 per million tokens. Released September 10, 2026 by Sakana AI, it is built for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the DeepSWE coding-repair benchmark, claims to outperform flagship models like GPT-6 Astra and Claude Fable 5.1 despite its underlying orchestration pool reportedly excluding both of them, and 1M-token context window.
Its trade-offs: not a single trained model — Sakana describes Fugu as "a Multi-Agent System, Delivered as One Model" that dynamically routes tasks across a pool of other models, so head-to-head benchmark framing against monolithic frontier models should be read skeptically, pricing rises to roughly $10/$45 per million tokens for prompts above 272K tokens, and benchmark comparisons against GPT-6 Astra and Claude Fable 5.1 are Sakana's own self-reported figures, not independently verified head-to-head scores. At $5 in / $30 out per million tokens, it sits in the premium price band.
The bottom line for this matchup
Doubao Seed 2.0 Pro and Fugu Ultra v2.0 overlap enough that the right pick depends on your specific job. Doubao Seed 2.0 Pro costs less per token; Fugu Ultra v2.0 holds the larger context; and each leads in its own area — Doubao Seed 2.0 Pro for powers china's most-used consumer ai app, with strong multimodal reasoning, Fugu Ultra v2.0 for sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark. Rather than crowning one, run the same hard task through both once and let the results decide.
Want both Doubao Seed 2.0 Pro and Fugu Ultra v2.0 without two subscriptions? LumiChats gives you these plus 40+ models under one ₹69/day pass (about $1/day) — draft with one, cross-check with the other.
Is Doubao Seed 2.0 Pro or Fugu Ultra v2.0 better for coding?
Public SWE-Bench figures are not available for either model, so the honest test is your own repository — run an identical real bug through both. By design, Doubao Seed 2.0 Pro leans toward powers china's most-used consumer ai app, with strong multimodal reasoning while Fugu Ultra v2.0 leans toward sakana's own evaluation reports best-or-joint-best results on 5 of 8 benchmarks tested, including a 74.3 on the deepswe coding-repair benchmark, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Doubao Seed 2.0 Pro or Fugu Ultra v2.0?
Doubao Seed 2.0 Pro is cheaper — $0.47/$2.37 per 1M tokens vs $5/$30 per 1M tokens, roughly 11× apart on input.
Which has the bigger context window?
Fugu Ultra v2.0 — 1M tokens vs 256K, about 3.9× larger. Useful only if the model actually reasons over the full window, which not all do.
Can I use both Doubao Seed 2.0 Pro and Fugu Ultra v2.0 together?
Yes — a multi-model platform like LumiChats gives you Doubao Seed 2.0 Pro, Fugu Ultra v2.0 and 40+ others under one ₹69/day pass (about $1/day), so you can draft with one and cross-check with the other instead of buying two subscriptions.
Which is newer, Doubao Seed 2.0 Pro or Fugu Ultra v2.0?
Fugu Ultra v2.0 — released September 10, 2026, about 7 months after Doubao Seed 2.0 Pro.
Specifications and benchmarks reflect publicly reported figures as of June 2026 and may change as providers release updates. Always verify on your own workload.