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 Claude 4.8 OpusAnthropic |  GPT-5.5OpenAI | Claude 4.6 Sonnet Anthropic | |
|---|---|---|---|
| Vendor | Anthropic | OpenAI | Anthropic |
| Family | Claude | GPT | Claude |
| Release date | 2026-05-28 | 2026-04-23 | 2026-02-17 |
| Context window | 1,000,000 tokens | 400,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision | text, vision, audio | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | Anthropic's flagship hybrid-reasoning model — Opus 4.8 pushes coding and AI-agent workflows further (agentic coding 69.2% vs 64.3% on 4.7; multidisciplinary reasoning 57.9% vs 54.7%). 1M-token context, $5/$25 per MTok pricing held flat from Opus 4.7. Introduces Dynamic Workflows for Claude Code (research preview). GA on Anthropic API (`claude-opus-4-8`), AWS Bedrock, Google Vertex, Microsoft Foundry, and GitHub Copilot. | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | — | 87.6% | 85.4% |
| GPQA-D | — | 89.4% | 85.8% |
| HumanEval | — | 96.8% | 95.9% |
| Aider | — | 89.7% | 83.6% |
| AIME-25 | — | 94.2% | 87.4% |
| LiveCB | — | 78.9% | 73.8% |
| MMMU | — | 78.4% | — |
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Claude 4.8 Opus✓
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