Both are Anthropic models. Claude Sonnet 4.6 is the newer, generally stronger default; reach for Claude Haiku 4.5 when its lower price or specific profile matters more than the latest capabilities.
Claude Haiku 4.5 and Claude Sonnet 4.6 are both Anthropic models, so the real question is not which lab to trust but which tier fits your workload and budget. Claude Haiku 4.5 is anthropic's fastest, most compact model — built for speed and volume. Claude Sonnet 4.6 is opus-class quality on most tasks at roughly 60% lower cost — the default workhorse. Since both come from the same lab, the comparison below focuses on the tier-and-cost trade-offs that actually separate them.
Key differences
Price: Claude Haiku 4.5 is about 3× cheaper on input ($1/$5 per 1M tokens vs $3/$15 per 1M tokens) — meaningful once you are processing millions of tokens a month.
Context window: Claude Sonnet 4.6 holds 5× more — 1M (~1,500 pages) vs 200K (~300 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 5 months (released February 2026), usually meaning fresher training data and capabilities.
Specifications
Spec
Claude Haiku 4.5
Claude Sonnet 4.6
Provider
Anthropic (US)
Anthropic (US)
Released
2025
February 2026
Context window
200K (~300 pages)
1M (~1,500 pages)
Price (in/out)
$1/$5 per 1M tokens
$3/$15 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
Not published
80%
MRCR v2 @ 1M
Not published
Not published
Who wins what
Fastest Claude model: Claude Haiku 4.5 — A core design strength of Claude Haiku 4.5.
Low-latency, high-volume API calls: Claude Haiku 4.5 — A core design strength of Claude Haiku 4.5.
Real-time interactions: Claude Haiku 4.5 — A core design strength of Claude Haiku 4.5.
Best value in the Claude family: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Everyday professional work: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Long-document analysis: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Lowest cost at scale: Claude Haiku 4.5 — At $1/$5 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 5× larger, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume: Claude Haiku 4.5 — At $1/$5 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 fastest claude model: Claude Haiku 4.5 — It is specifically built for that.
Anyone whose priority is best value in the claude family: Claude Sonnet 4.6 — That is its strongest area.
Claude Haiku 4.5: where it fits
Anthropic's fastest, most compact model — built for speed and volume. Released 2025 by Anthropic, it is built for fastest Claude model, low-latency, high-volume API calls, real-time interactions, and cheapest Claude tier.
Its trade-offs are real: smallest context in the family (200K), and not for deep reasoning. At $1 in / $5 out per million tokens, it sits in the budget price band.
Claude Sonnet 4.6: where it fits
Opus-class quality on most tasks at roughly 60% lower cost — the default workhorse. Released February 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: 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.
The bottom line for this matchup
Because Claude Haiku 4.5 and Claude Sonnet 4.6 come from the same lab (Anthropic), they share the same training philosophy and ecosystem — the decision is purely tier vs. cost. Claude Sonnet 4.6 is the more capable, more recent option; the other earns its place only when its price or latency profile fits a specific job better. Most teams should default to Claude Sonnet 4.6 and drop down only with a concrete reason.
Frequently asked questions
Is Claude Haiku 4.5 or Claude Sonnet 4.6 better for coding?
Public SWE-Bench figures are not available for Claude Haiku 4.5, so the honest test is your own repository — run an identical real bug through both. By design, Claude Haiku 4.5 leans toward fastest claude model while Claude Sonnet 4.6 leans toward best value in the claude family, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Claude Haiku 4.5 or Claude Sonnet 4.6?
Claude Haiku 4.5 is cheaper — $1/$5 per 1M tokens vs $3/$15 per 1M tokens, roughly 3× apart on input.
Which has the bigger context window?
Claude Sonnet 4.6 — 1M vs 200K, about 5× larger. Useful only if the model actually reasons over the full window, which not all do.
Should I upgrade from Claude Haiku 4.5 to Claude Sonnet 4.6?
Since both are Anthropic models, the newer one (Claude Sonnet 4.6) is usually the better default unless you need a specific cost or latency profile from the other.
Which is newer, Claude Haiku 4.5 or Claude Sonnet 4.6?
Claude Sonnet 4.6 — released February 2026, about 5 months after Claude Haiku 4.5.
Claude Haiku 4.5 vs Claude Sonnet 4.6
Anthropic · US | Anthropic · US · Updated June 2026
Quick verdict
Both are Anthropic models. Claude Sonnet 4.6 is the newer, generally stronger default; reach for Claude Haiku 4.5 when its lower price or specific profile matters more than the latest capabilities.
Claude Haiku 4.5 and Claude Sonnet 4.6 are both Anthropic models, so the real question is not which lab to trust but which tier fits your workload and budget. Claude Haiku 4.5 is anthropic's fastest, most compact model — built for speed and volume. Claude Sonnet 4.6 is opus-class quality on most tasks at roughly 60% lower cost — the default workhorse. Since both come from the same lab, the comparison below focuses on the tier-and-cost trade-offs that actually separate them.
Key differences at a glance
▸Price: Claude Haiku 4.5 is about 3× cheaper on input ($1/$5 per 1M tokens vs $3/$15 per 1M tokens) — meaningful once you are processing millions of tokens a month.
▸Context window: Claude Sonnet 4.6 holds 5× more — 1M (~1,500 pages) vs 200K (~300 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 5 months (released February 2026), usually meaning fresher training data and capabilities.
Side-by-side specs
Spec
Claude Haiku 4.5
Claude Sonnet 4.6
Provider
Anthropic (US)
Anthropic (US)
Released
2025
February 2026
Context window
200K (~300 pages)
1M (~1,500 pages)
Price (in/out)
$1/$5 per 1M tokens
$3/$15 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
Not published
80%
MRCR v2 @ 1M
Not published
Not published
Who wins what
Fastest Claude model
Claude Haiku 4.5
A core design strength of Claude Haiku 4.5.
Low-latency, high-volume API calls
Claude Haiku 4.5
A core design strength of Claude Haiku 4.5.
Real-time interactions
Claude Haiku 4.5
A core design strength of Claude Haiku 4.5.
Best value in the Claude family
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Everyday professional work
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Long-document analysis
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Lowest cost at scale
Claude Haiku 4.5
At $1/$5 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 5× larger, fitting roughly 1,500 pages in one prompt.
Which should you pick?
A cost-sensitive startup shipping high volume
→ Claude Haiku 4.5
At $1/$5 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 fastest claude model
→ Claude Haiku 4.5
It is specifically built for that.
Anyone whose priority is best value in the claude family
→ Claude Sonnet 4.6
That is its strongest area.
Claude Haiku 4.5: where it fits
Anthropic's fastest, most compact model — built for speed and volume. Released 2025 by Anthropic, it is built for fastest Claude model, low-latency, high-volume API calls, real-time interactions, and cheapest Claude tier.
Its trade-offs are real: smallest context in the family (200K), and not for deep reasoning. At $1 in / $5 out per million tokens, it sits in the budget price band.
Claude Sonnet 4.6: where it fits
Opus-class quality on most tasks at roughly 60% lower cost — the default workhorse. Released February 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: 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.
The bottom line for this matchup
Because Claude Haiku 4.5 and Claude Sonnet 4.6 come from the same lab (Anthropic), they share the same training philosophy and ecosystem — the decision is purely tier vs. cost. Claude Sonnet 4.6 is the more capable, more recent option; the other earns its place only when its price or latency profile fits a specific job better. Most teams should default to Claude Sonnet 4.6 and drop down only with a concrete reason.
Want both Claude Haiku 4.5 and Claude Sonnet 4.6 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 Haiku 4.5 or Claude Sonnet 4.6 better for coding?
Public SWE-Bench figures are not available for Claude Haiku 4.5, so the honest test is your own repository — run an identical real bug through both. By design, Claude Haiku 4.5 leans toward fastest claude model while Claude Sonnet 4.6 leans toward best value in the claude family, and that positioning usually predicts which feels better on your codebase.
Which is cheaper, Claude Haiku 4.5 or Claude Sonnet 4.6?
Claude Haiku 4.5 is cheaper — $1/$5 per 1M tokens vs $3/$15 per 1M tokens, roughly 3× apart on input.
Which has the bigger context window?
Claude Sonnet 4.6 — 1M vs 200K, about 5× larger. Useful only if the model actually reasons over the full window, which not all do.
Should I upgrade from Claude Haiku 4.5 to Claude Sonnet 4.6?
Since both are Anthropic models, the newer one (Claude Sonnet 4.6) is usually the better default unless you need a specific cost or latency profile from the other.
Which is newer, Claude Haiku 4.5 or Claude Sonnet 4.6?
Claude Sonnet 4.6 — released February 2026, about 5 months after Claude Haiku 4.5.
Specifications and benchmarks reflect publicly reported figures as of June 2026 and may change as providers release updates. Always verify on your own workload.