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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Claude Sonnet 5.5 (Anthropic) and Claude Haiku 5.5 (Anthropic).
| Metric / Capability | Claude Sonnet 5.5 | Claude Haiku 5.5 |
|---|---|---|
| Developer / Organization | Anthropic | Anthropic |
| Release Date | 2026-09-28 | 2026-10-07 |
| Deployment / Weights | Proprietary Cloud API | Proprietary Cloud API |
| Context Window | 1M tokens (1,000,000 tokens) | 1M tokens (1,000,000 tokens) |
| Input Pricing (/1M Tokens) | $2 | $0.1 |
| Output Pricing (/1M Tokens) | $10 | $0.5 |
| Benchmark / Domain | Claude Sonnet 5.5 | Claude Haiku 5.5 | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 56.0% | 43.4% | Claude Sonnet 5.5 (+29%) |
Artificial Analysis Coding Agent Index v2.0 Composite index of coding-agent systems (model + harness) across FrontierCode v1.1, SWE-Atlas-QnA, and Terminal-Bench v4. | 59.3% | 37.3% | Claude Sonnet 5.5 (+59%) |
SWE-bench Pro Harder, contamination-resistant successor to SWE-bench spanning multiple languages. | 81.3% | — | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 70.6% | 39.2% | Claude Sonnet 5.5 (+80%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 83.9% | 61.3% | Claude Sonnet 5.5 (+37%) |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | 56.9% | 45.9% | Claude Sonnet 5.5 (+24%) |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 88.8% | 75.1% | Claude Sonnet 5.5 (+18%) |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1413 | 1344 | Claude Sonnet 5.5 (+5%) |
Claude Sonnet 5.5 leads across 7 evaluated benchmarks compared to 0 for Claude Haiku 5.5, showing notable advantages in Artificial Analysis Intelligence Index, Artificial Analysis Coding Agent Index v2.0, Terminal-Bench 4.0.
Both models feature equivalent context windows of 1M tokens (1,000,000 tokens).
Claude Haiku 5.5 is more economical. Input tokens cost $0.1/M tokens compared to $2/M tokens for Claude Sonnet 5.5.
Claude Sonnet 5.5 is a proprietary cloud API. Claude Haiku 5.5 is a proprietary cloud API.
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