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 GPT-5.5OpenAI | GPT-5 OpenAI |  Claude 4.8 OpusAnthropic | |
|---|---|---|---|
| Vendor | OpenAI | OpenAI | Anthropic |
| Family | GPT | GPT | Claude |
| Release date | 2026-04-23 | 2025-08-07 | 2026-05-28 |
| Context window | 400,000 tokens | 400,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision, audio | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary |
| Description | 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. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | 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. |
| Links | |||
| Benchmarks | |||
| MMLU-Pro | 87.6% | 85.1% | — |
| GPQA-D | 89.4% | 87.3% | — |
| HumanEval | 96.8% | 95.2% | — |
| Aider | 89.7% | 85.4% | — |
| AIME-25 | 94.2% | 91.0% | — |
| LiveCB | 78.9% | 74.5% | — |
| MMMU | 78.4% | 74.1% | — |
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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+