Claude Opus 5 vs Claude Opus 5.5
Claude Opus 5 (Anthropic) and Claude Opus 5.5 (Anthropic) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Opus 5.5 leads on overall intelligence (ECI 167 vs 163).
- Claude Opus 5.5 is cheaper on input tokens: $4.00 vs $5.00 per 1M.
- Claude Opus 5.5 ranks higher for coding (100th vs 89th percentile).
| Attribute | Claude Opus 5 | Claude Opus 5.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 167 |
| Coding | 89 | 100 |
| Math | 79 | 88 |
| Reasoning & Knowledge | 90 | 90 |
| Agentic & Tools | 93 | 97 |
| Specifications | ||
| Developer | Anthropic | Anthropic |
| Family | Claude | Claude |
| Released | Jul 24, 2026 | Sep 22, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1M |
| Price — $/M input | $5.00 | $4.00 |
| Price — $/M output | $25.00 | $20.00 |
| Inputs | text, image, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 99% | 100% |
| APEX | 66% | 74% |
| ARC-AGI | 98% | 99% |
| ARC-AGI-2 | 90% | 93% |
| GPQA Diamond | 94% | 91% |
| Humanity's Last Exam | 55% | 61% |
| SciCode | 56% | 67% |
| SimpleBench | 81% | — |
| SimpleQA Verified | 60% | 72% |
| WebDev Arena | 1687 | 1820 |
| WeirdML | 92% | — |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Claude Opus 5 better than Claude Opus 5.5?
On Epoch AI's Capabilities Index, Claude Opus 5.5 scores higher (167) than Claude Opus 5 (163). The right pick depends on your task, so compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Opus 5 or Claude Opus 5.5?
Claude Opus 5.5 is cheaper on input tokens at $4.00 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Opus 5 or Claude Opus 5.5?
Neither: both support up to 1M tokens.
Which is better for coding, Claude Opus 5 or Claude Opus 5.5?
Claude Opus 5.5 ranks higher across coding benchmarks like WebDev Arena and SciCode: 100th vs 89th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.