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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Claude Opus 4.8 (Anthropic) and Claude Haiku 5.5 (Anthropic).
| Metric / Capability | Claude Opus 4.8 | Claude Haiku 5.5 |
|---|---|---|
| Developer / Organization | Anthropic | Anthropic |
| Release Date | 2026-05-27 | 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) | $5 | $0.1 |
| Output Pricing (/1M Tokens) | $25 | $0.5 |
| Benchmark / Domain | Claude Opus 4.8 | Claude Haiku 5.5 | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 41.8% | 43.4% | Claude Haiku 5.5 (+4%) |
Artificial Analysis Coding Index Composite index of coding and software-engineering evaluations. | 74.3% | — | — |
Artificial Analysis Agentic Index Composite index of tool-use and long-horizon agentic tasks. | 41.9% | — | — |
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. | — | 37.3% | — |
SWE-bench Pro Harder, contamination-resistant successor to SWE-bench spanning multiple languages. | 69.2% | — | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 23.6% | 39.2% | Claude Haiku 5.5 (+66%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 72.1% | 61.3% | Claude Opus 4.8 (+18%) |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | 93.6% | — | — |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | 49.8% | 45.9% | Claude Opus 4.8 (+8%) |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 80.0% | 75.1% | Claude Opus 4.8 (+7%) |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1310 | 1344 | Claude Haiku 5.5 (+3%) |
Both models perform neck-and-neck across available benchmarks, with Claude Opus 4.8 and Claude Haiku 5.5 each excelling in distinct tasks.
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 $5/M tokens for Claude Opus 4.8.
Claude Opus 4.8 is a proprietary cloud API. Claude Haiku 5.5 is a proprietary cloud API.
Analyze 130+ models side-by-side using interactive radar charts, cost-efficiency quadrant plots, and live dataset filters on the full NeuBench index.
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