Claude Opus 4.7 vs GPT-5.5
2026 - Pricing, benchmarks, and use case comparison
Quick take
- •GPT-5.5 is open-weights - free to self-host with no API costs. Claude Opus 4.7 requires paid API access.
- •Claude Opus 4.7 has a 200K context window - 2x larger than GPT-5.5's 128K. Better for long documents and large codebases.
Specs comparison
| Claude Opus 4.7 | GPT-5.5 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓200K | 128K |
| Input / 1M tokens | $15.00 | ✓Free (self-host) |
| Output / 1M tokens | $75.00 | Free (self-host) |
| Release date | 2025-09 | 2026-04 |
Benchmarks
| Benchmark | Claude Opus 4.7 | GPT-5.5 |
|---|---|---|
| GPQA Diamond | ~75% | - |
| MMLU | ~90% | - |
| HumanEval | ~95% | - |
Scores sourced from official provider release posts.
Strengths
Claude Opus 4.7
- ✓Best-in-class multi-step reasoning
- ✓Strong scientific and mathematical analysis
- ✓Superior long-context comprehension
- ✓Highly accurate instruction following
- ✓Best Anthropic model for research and analysis
GPT-5.5
- ✓Improved instruction following over GPT-4o
- ✓Stronger long-context coherence
- ✓Better output consistency for agentic pipelines
- ✓GPT-5.5 Pro tier for reliability-critical workloads
- ✓Easier migration path than jumping from GPT-4o to GPT-5
Which should you choose?
Choose Claude Opus 4.7 if you need...
- →Complex research tasks
- →High-stakes code generation
- →Long-document analysis
- →Scientific reasoning
Choose GPT-5.5 if you need...
- →Production API integrations migrating from GPT-4o
- →Agentic workflows needing consistent structured output
- →Long-context document tasks
- →Teams deferring full GPT-5 migration costs