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 DeepSeek-V3.1DeepSeek |  Claude 4.8 OpusAnthropic |  GPT-5.5OpenAI | |
|---|---|---|---|
| Vendor | DeepSeek | Anthropic | OpenAI |
| Family | DeepSeek | Claude | GPT |
| Release date | 2025-08-21 | 2026-05-28 | 2026-04-23 |
| Context window | 128,000 tokens | 1,000,000 tokens | 400,000 tokens |
| Parameters | 671B | — | — |
| Modality | text | text, vision | text, vision, audio |
| License | MIT | proprietary | proprietary |
| Source | open weights | proprietary | proprietary |
| Description | Large MoE open-weight model. Predecessor to DeepSeek-V4. | 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. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | — | — | 87.6% |
| GPQA-D | — | — | 89.4% |
| HumanEval | — | — | 96.8% |
| Aider | — | — | 89.7% |
| AIME-25 | — | — | 94.2% |
| LiveCB | — | — | 78.9% |
| MMMU | — | — | 78.4% |
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Claude 4.8 Opus✓
Qwen3.7-Max+
Gemini 3.5+Gemini Omni+GPT-5.5✓Qwen3.6-27B+DeepSeek-V4-Flash+DeepSeek-V4-Pro+Gemini 3 Pro+Claude 4.7 Opus+Claude 4.6 Sonnet+Claude 4.5 Haiku+DeepSeek-V3.1✓GPT-5+
Grok 4+Gemini 2.5 Flash+Qwen3 235B+o3+GPT-4.1+
Llama 4 Scout+Llama 4 Maverick+Gemini 2.5 Pro+DeepSeek-R1+
Mistral Large 2+