GPT-5.6 Terra Pro vs Mistral Small 4
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 GPT-5.6 Terra Pro and Mistral Small 4.
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
Mistral Small 4
Mistral Small 4 is the next major release in the Mistral Small family, unifying the capabilities of several flagship Mistral models into a single system. It combines strong reasoning from...
Technical Specifications
| Specification | GPT-5.6 Terra Pro | Mistral Small 4 |
|---|---|---|
| Provider | OpenAI | Mistral |
| Context Window | 1,050,000 tokens | 262,144 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | beta | stable |
| API Available | Yes | Yes |
| Released Date | 2026-07-09 | 2026-03-16 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.6 Terra Pro
$2.50
Mistral Small 4
$0.15
Output Price per Million Tokens
GPT-5.6 Terra Pro
$15.00
Mistral Small 4
$0.60
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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.
GPT-5.6 Terra Pro Quirks & Gotchas
No developer gotchas reported.
Mistral Small 4 Quirks & Gotchas
No developer gotchas reported.