Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Anthropic: Claude Opus 5.5 (batch) — Anthropic. Context window 1,000,000 tokens. API pricing (per 1M tokens): Input $2, Output $10. License: Proprietary. LMArena 1,512. GPQA Diamond 90.6%.
| Provider | Anthropic |
|---|---|
| API model ID | anthropic/claude-opus-5.5:batch |
| Tier | Frontier |
| Context window | 1,000,000 tokens |
| Max output | 128,000 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $2 |
| API pricing (per 1M tokens) · Output | $10 |
| LMArena | 1,512 (claude-opus-5.5-high) |
| GPQA Diamond | 90.6% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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