Claude Opus 4.1 vs GPT-5.6 Terra Pro
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Opus 4.1 and GPT-5.6 Terra Pro.
Claude Opus 4.1
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains...
GPT-5.6 Terra Pro
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode
Technical Specifications
| Specification | Claude Opus 4.1 | GPT-5.6 Terra Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context Window | 200,000 tokens | 1,050,000 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2025-08-05 | 2026-07-09 |
API Pricing Comparison
Input Price per Million Tokens
Claude Opus 4.1
$15.00
GPT-5.6 Terra Pro
$2.50
Output Price per Million Tokens
Claude Opus 4.1
$75.00
GPT-5.6 Terra Pro
$15.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Opus 4.1 Quirks & Gotchas
No developer gotchas reported.
GPT-5.6 Terra Pro Quirks & Gotchas
No developer gotchas reported.