Pick Claude Sonnet 4.6 for best value in the claude family or everyday professional work. Pick GPT-5.2 for strong all-round reasoning or reliable structured output. On a tight budget at scale, GPT-5.2 is the value pick.
Claude Sonnet 4.6 (Anthropic) and GPT-5.2 (OpenAI) are two of the models people most often weigh against each other in 2026. Claude Sonnet 4.6 is opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). GPT-5.2 is a capable GPT-5-generation all-rounder, now succeeded by GPT-5.5. They diverge most on price and context window — each quantified below from the models' real specs.
Key differences
Price: GPT-5.2 is about 1.7× cheaper on input ($1.75/$14 per 1M tokens vs $3/$15 per 1M tokens) — modest, but it adds up at steady volume.
Context window: Claude Sonnet 4.6 holds 2.5× more — 1M (~1,500 pages) vs 400K (~600 pages). But effective recall usually fades long before the advertised ceiling, so the bigger number only helps if the model reasons over it.
Recency: Claude Sonnet 4.6 is the newer model by about 2 months (released February 17, 2026), usually meaning fresher training data and capabilities.
Specifications
Spec
Claude Sonnet 4.6
GPT-5.2
Provider
Anthropic (US)
OpenAI (US)
Released
February 17, 2026
December 11, 2025
Context window
1M (~1,500 pages)
400K (~600 pages)
Price (in/out)
$3/$15 per 1M tokens
$1.75/$14 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
79.6%
Not published
MRCR v2 @ 1M
Not published
Not published
Who wins what
Best value in the Claude family: Claude Sonnet 4.6 — Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026) — and it carries the larger 1M context.
Everyday professional work: Claude Sonnet 4.6 — Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026) — and it is the newer of the two.
Long-document analysis: Claude Sonnet 4.6 — Its 1M window holds about 2.5× more than GPT-5.2's 400K in a single prompt.
Strong all-round reasoning: GPT-5.2 — A capable GPT-5-generation all-rounder, now succeeded by GPT-5.5 — and it runs cheaper at $1.75/$14 per 1M tokens.
Reliable structured output: GPT-5.2 — GPT-5.2 lists reliable structured output among its strengths; Claude Sonnet 4.6 does not.
Broad ecosystem and tooling: GPT-5.2 — GPT-5.2 lists broad ecosystem and tooling among its strengths; Claude Sonnet 4.6 does not.
Lowest cost at scale: GPT-5.2 — At $1.75/$14 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Largest single-prompt input: Claude Sonnet 4.6 — Its 1M window is about 2.5× larger than GPT-5.2's 400K, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume: GPT-5.2 — At $1.75/$14 per 1M tokens it undercuts Claude Sonnet 4.6, and on millions of tokens that margin decides the monthly bill.
Someone analysing very long documents or codebases: Claude Sonnet 4.6 — Larger 1M window fits more in one prompt.
Anyone whose priority is best value in the claude family: Claude Sonnet 4.6 — It is specifically built for that.
Anyone whose priority is strong all-round reasoning: GPT-5.2 — That is its strongest area.
Claude Sonnet 4.6: where it fits
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Released February 17, 2026 by Anthropic, it is built for best value in the Claude family, everyday professional work, long-document analysis, and coding at lower cost than Opus.
Its trade-offs are real: trails Opus on the hardest agentic tasks, and not an open-weight option. At $3 in / $15 out per million tokens, it sits in the mid price band.
GPT-5.2: where it fits
A capable GPT-5-generation all-rounder, now succeeded by GPT-5.5. Released December 11, 2025 by OpenAI, it is built for strong all-round reasoning, reliable structured output, broad ecosystem and tooling, and professional workflows.
Its trade-offs: superseded by GPT-5.5, and smaller context than flagships. At $1.75 in / $14 out per million tokens, it sits in the mid price band.
The bottom line for this matchup
Claude Sonnet 4.6 and GPT-5.2 overlap enough that the right pick depends on your specific job. GPT-5.2 costs less per token; Claude Sonnet 4.6 holds the larger context; and each leads in its own area — Claude Sonnet 4.6 for best value in the claude family, GPT-5.2 for strong all-round reasoning. Rather than crowning one, run the same hard task through both once and let the results decide.
Frequently asked questions
Is Claude Sonnet 4.6 or GPT-5.2 better for coding?
Public SWE-Bench figures are not available for GPT-5.2, so the honest test is your own repository — run an identical real bug through both. By design, Claude Sonnet 4.6 leans toward best value in the claude family while GPT-5.2 leans toward strong all-round reasoning, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Claude Sonnet 4.6 or GPT-5.2?
GPT-5.2 is cheaper — $3/$15 per 1M tokens vs $1.75/$14 per 1M tokens, roughly 1.7× apart on input.
Which has the bigger context window?
Claude Sonnet 4.6 — 1M vs 400K, about 2.5× larger. Useful only if the model actually reasons over the full window, which not all do.
Can I use both Claude Sonnet 4.6 and GPT-5.2 together?
Yes — a multi-model platform like LumiChats gives you Claude Sonnet 4.6, GPT-5.2 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, Claude Sonnet 4.6 or GPT-5.2?
Claude Sonnet 4.6 — released February 17, 2026, about 2 months after GPT-5.2.
Claude Sonnet 4.6 vs GPT-5.2
Anthropic · US | OpenAI · US · Updated June 2026
Quick verdict
Pick Claude Sonnet 4.6 for best value in the claude family or everyday professional work. Pick GPT-5.2 for strong all-round reasoning or reliable structured output. On a tight budget at scale, GPT-5.2 is the value pick.
Claude Sonnet 4.6 (Anthropic) and GPT-5.2 (OpenAI) are two of the models people most often weigh against each other in 2026. Claude Sonnet 4.6 is opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). GPT-5.2 is a capable GPT-5-generation all-rounder, now succeeded by GPT-5.5. They diverge most on price and context window — each quantified below from the models' real specs.
Key differences at a glance
▸Price: GPT-5.2 is about 1.7× cheaper on input ($1.75/$14 per 1M tokens vs $3/$15 per 1M tokens) — modest, but it adds up at steady volume.
▸Context window: Claude Sonnet 4.6 holds 2.5× more — 1M (~1,500 pages) vs 400K (~600 pages). But effective recall usually fades long before the advertised ceiling, so the bigger number only helps if the model reasons over it.
▸Recency: Claude Sonnet 4.6 is the newer model by about 2 months (released February 17, 2026), usually meaning fresher training data and capabilities.
Side-by-side specs
Spec
Claude Sonnet 4.6
GPT-5.2
Provider
Anthropic (US)
OpenAI (US)
Released
February 17, 2026
December 11, 2025
Context window
1M (~1,500 pages)
400K (~600 pages)
Price (in/out)
$3/$15 per 1M tokens
$1.75/$14 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
79.6%
Not published
MRCR v2 @ 1M
Not published
Not published
Who wins what
Best value in the Claude family
Claude Sonnet 4.6
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026) — and it carries the larger 1M context.
Everyday professional work
Claude Sonnet 4.6
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026) — and it is the newer of the two.
Long-document analysis
Claude Sonnet 4.6
Its 1M window holds about 2.5× more than GPT-5.2's 400K in a single prompt.
Strong all-round reasoning
GPT-5.2
A capable GPT-5-generation all-rounder, now succeeded by GPT-5.5 — and it runs cheaper at $1.75/$14 per 1M tokens.
Reliable structured output
GPT-5.2
GPT-5.2 lists reliable structured output among its strengths; Claude Sonnet 4.6 does not.
Broad ecosystem and tooling
GPT-5.2
GPT-5.2 lists broad ecosystem and tooling among its strengths; Claude Sonnet 4.6 does not.
Lowest cost at scale
GPT-5.2
At $1.75/$14 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Largest single-prompt input
Claude Sonnet 4.6
Its 1M window is about 2.5× larger than GPT-5.2's 400K, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume
→ GPT-5.2
At $1.75/$14 per 1M tokens it undercuts Claude Sonnet 4.6, and on millions of tokens that margin decides the monthly bill.
Someone analysing very long documents or codebases
→ Claude Sonnet 4.6
Larger 1M window fits more in one prompt.
Anyone whose priority is best value in the claude family
→ Claude Sonnet 4.6
It is specifically built for that.
Anyone whose priority is strong all-round reasoning
→ GPT-5.2
That is its strongest area.
Claude Sonnet 4.6: where it fits
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Released February 17, 2026 by Anthropic, it is built for best value in the Claude family, everyday professional work, long-document analysis, and coding at lower cost than Opus.
Its trade-offs are real: trails Opus on the hardest agentic tasks, and not an open-weight option. At $3 in / $15 out per million tokens, it sits in the mid price band.
GPT-5.2: where it fits
A capable GPT-5-generation all-rounder, now succeeded by GPT-5.5. Released December 11, 2025 by OpenAI, it is built for strong all-round reasoning, reliable structured output, broad ecosystem and tooling, and professional workflows.
Its trade-offs: superseded by GPT-5.5, and smaller context than flagships. At $1.75 in / $14 out per million tokens, it sits in the mid price band.
The bottom line for this matchup
Claude Sonnet 4.6 and GPT-5.2 overlap enough that the right pick depends on your specific job. GPT-5.2 costs less per token; Claude Sonnet 4.6 holds the larger context; and each leads in its own area — Claude Sonnet 4.6 for best value in the claude family, GPT-5.2 for strong all-round reasoning. Rather than crowning one, run the same hard task through both once and let the results decide.
Want both Claude Sonnet 4.6 and GPT-5.2 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 Claude Sonnet 4.6 or GPT-5.2 better for coding?
Public SWE-Bench figures are not available for GPT-5.2, so the honest test is your own repository — run an identical real bug through both. By design, Claude Sonnet 4.6 leans toward best value in the claude family while GPT-5.2 leans toward strong all-round reasoning, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Claude Sonnet 4.6 or GPT-5.2?
GPT-5.2 is cheaper — $3/$15 per 1M tokens vs $1.75/$14 per 1M tokens, roughly 1.7× apart on input.
Which has the bigger context window?
Claude Sonnet 4.6 — 1M vs 400K, about 2.5× larger. Useful only if the model actually reasons over the full window, which not all do.
Can I use both Claude Sonnet 4.6 and GPT-5.2 together?
Yes — a multi-model platform like LumiChats gives you Claude Sonnet 4.6, GPT-5.2 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, Claude Sonnet 4.6 or GPT-5.2?
Claude Sonnet 4.6 — released February 17, 2026, about 2 months after GPT-5.2.
Specifications and benchmarks reflect publicly reported figures as of June 2026 and may change as providers release updates. Always verify on your own workload.