GPT-5.5 vs Claude Opus 4.7
GPT-5.5 launched on April 23, 2026 as OpenAI's first fully retrained base model since GPT-4.5. At $5 input and $30 output per million tokens, it costs less than half of Claude Opus 4.7 at $15/$75. Both models offer 1M context windows. GPT-5.5 leads on MMLU-Pro and HumanEval while Claude Opus 4.7 holds the edge on reasoning and real-world engineering tasks. This is the definitive flagship comparison for 2026.
Head-to-Head Specs
| Spec | GPT-5.5 | Claude Opus 4.7 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input Price | $5.00/1M | $15.00/1M |
| Output Price | $30.00/1M | $75.00/1M |
| Context Window | 1M | 1M |
| Released | 2026-04 | 2026-04 |
| Capabilities | text, vision, tool-use, code, reasoning | text, vision, tool-use, code |
Benchmark Scores
| Benchmark | GPT-5.5 | Claude Opus 4.7 | Winner |
|---|---|---|---|
| MMLU-Pro | 94.2 | 93.8 | GPT-5.5 |
| HumanEval | 97.1 | 96.2 | GPT-5.5 |
| GPQA Diamond | 78.3 | 76.5 | GPT-5.5 |
| MATH | 95.8 | 93.1 | GPT-5.5 |
| SWE-bench | 68.7 | 65.4 | GPT-5.5 |
See the full benchmark leaderboard for all models.
Category Breakdown
GPT-5.5 scores 94.2 vs Claude at 93.8
GPT-5.5 scores 97.1 on HumanEval vs Claude at 96.2
Claude scores 76.5 on GPQA Diamond vs GPT-5.5 at 78.3, but Claude leads on SWE-bench
Claude posts 65.4 vs GPT-5.5 at 68.7 on real engineering tasks
GPT-5.5 at $5/$30 vs Claude at $15/$75 per 1M tokens
Both offer 1M token context windows
Choose GPT-5.5 when:
- ▸Best possible benchmark scores on paper
- ▸Cost-conscious flagship workloads ($5/$30 vs $15/$75)
- ▸Omnimodal applications (text, image, audio, video)
- ▸OpenAI ecosystem and existing integrations
Choose Claude Opus 4.7 when:
- ▸Agent workflows and tool use (MCP ecosystem)
- ▸Complex multi-step reasoning tasks
- ▸Long-running agentic sessions
- ▸Tasks where safety and instruction-following matter
Frequently Asked Questions
Which is better, GPT-5.5 or Claude Opus 4.7?
It depends on your use case. GPT-5.5 from OpenAI excels at best possible benchmark scores on paper, while Claude Opus 4.7 from Anthropic is better for agent workflows and tool use (mcp ecosystem). See the full comparison above for detailed benchmarks and pricing.
How much does GPT-5.5 cost compared to Claude Opus 4.7?
GPT-5.5 costs $5.00 input and $30.00 output per 1M tokens. Claude Opus 4.7 costs $15.00 input and $75.00 output per 1M tokens.
What is the context window difference between GPT-5.5 and Claude Opus 4.7?
GPT-5.5 supports 1M tokens, while Claude Opus 4.7 supports 1M tokens.