LLM Comparison
Mistral Small 4 vs GPT-5.5 Pro
Side-by-side specs, pricing & capabilities · Updated May 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 21 55.7 | 97 0.9 |
| Family | Mistral | GPT |
| Status | Current | Current |
| Release Date | Mar 2026 | Apr 2026 |
| Context Window | 262K tokens | 1.1M tokens |
| Input Price | $0.15/M tokens | $30.00/M tokens |
| Output Price | $0.60/M tokens | $180.00/M tokens |
| Pricing Notes | Cache read: $0.0150/M tokens | No cached input discount. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Regional processing: 10% uplift. |
| Capabilities | textvisioncodetool-use | textvisioncodetool-useextended-thinkingweb-search |
| Training Cutoff | — | December 2025 |
| Max Output | — | 128K tokens |
| API Identifier | mistralai/mistral-small-2603 | openai/gpt-5.5-pro |
| Benchmarks | ||
| MMLU-Pro | 68.5mistral | — |
| HumanEval | 78.5mistral | — |
| MGSM | 72.3mistral | — |
| GPQA Diamond | 58.8mistral | — |
| LiveCodeBench | 64mistral | — |
| FrontierMath Tier 4 | — | 39.6openai |
| FrontierMath Tier 1-3 | — | 52.4openai |
| HLE (with tools) | — | 57.2openai |
| HLE (no tools) | — | 43.1openai |
| BrowseComp | — | 90.1openai |
| GeneBench | — | 33.2openai |
| GDPval | — | 82.3openai |
| Investment Banking Modeling | — | 88.6openai |
| View Mistral Small 4 | View GPT-5.5 Pro | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Mistral Small 4Cheapest | $0.15 | $0.30 | $0.45 | — |
| GPT-5.5 Pro | $30.00 | $90.00 | $120.00 | +26567% |
Mistral AI
Mistral Small 4
Mistral Small 4 is a multimodal llm from Mistral AI. Supports up to 262,144 token context window. Achieves 76.5% on MMLU. Available from $0.15/M input tokens.
OpenAI
GPT-5.5 Pro
GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Designed for the toughest problems, some requests may take several minutes. It excels at FrontierMath Tier 4 (39.6%) and BrowseComp (90.1%), offering the highest intelligence available from OpenAI at a premium price point.
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