GPT-5.5 vs Claude Opus 4.7
As of October 19, 2026, GPT-5.5 costs $5.00 input and $30.00 output per 1M tokens, and Claude Opus 4.7 costs $5.00 and $25.00. Claude Opus 4.7 is the cheaper of the two. On the TensorFeed Intelligence Index's older 2024 benchmark set, GPT-5.5 scores 69.8 and Claude Opus 4.7 scores 69.8 (as of October 24, 2026).
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 matches Claude Opus 4.7 on input and costs $5 more per million output tokens than Opus 4.7 at $5/$25. 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 | $5.00/1M |
| Output Price | $30.00/1M | $25.00/1M |
| 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 |
|---|---|---|---|
| SWE-bench | 82.6 | 87.6 | Claude |
| 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 |
| FrontierCode v1.1 | 43.0 | 38.5 | 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
GPT-5.5 scores 78.3 on GPQA Diamond vs Claude at 76.5
Claude posts 87.6 vs GPT-5.5 at 82.6 on SWE-bench Verified
$5.00/$30.00 for GPT-5.5 against $5.00/$25.00 for Claude Opus 4.7, per 1M input/output tokens
Both offer 1M token context windows
Choose GPT-5.5 when:
- ▸Best possible benchmark scores on paper
- ▸Math and graduate-level science questions
- ▸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 $5.00 input and $25.00 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.
Which scores higher on the TensorFeed Intelligence Index, GPT-5.5 or Claude Opus 4.7?
They tie. GPT-5.5 scores 69.8 and Claude Opus 4.7 scores 69.8 on the older 2024 benchmark set (as of October 24, 2026).