ModelRefs / o3 Pro vs Mistral Small 3.1
o3 Pro vs Mistral Small 3.1
o3 Pro vs Mistral Small 3.1: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Mistral Small 3.1: Mistral Small 3.1 is Mistral AI's 24-billion-parameter multimodal model, accepting text and image input across a context window of up to 128,000 tokens and published under Apache 2.0. Mistral reports inference speeds of 150 tokens per second and compares it with Gemma 3 and GPT-4o Mini in the same weight class. Its size and licence make it one of the larger models that remains practical to self-host on a single machine.
o3 Pro: o3 Pro is OpenAI's highest-capability reasoning model, applying extended compute at inference time to solve complex scientific, mathematical, and programming problems. It achieved the highest published scores on ARC-AGI-2 and competitive programming benchmarks at its June 2025 release.
Context window: Mistral Small 3.1 accepts up to 128,000 tokens, o3 Pro up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Mistral Small 3.1 vs o3 Pro at a glance
| Attribute | Mistral Small 3.1 | o3 Pro |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Released | 2025-03-17 | 2025-06-10 |
| Context window | 128,000 tokens | 200,000 tokens |
| Input price | $0.1/M tokens | $20/M tokens |
| Output price | $0.3/M tokens | $80/M tokens |
| Licence | Apache-2.0 | Proprietary |
| Self-hostable | Yes, open weights | No, hosted only |
| Modalities | text, vision | text, vision |
Where they differ most
- Reasoning: Mistral Small 3.1 63%, o3 Pro 32%. Mistral Small 3.1 leads on this dimension.
Capability scores are ModelRefs' own derived signals, not vendor claims or benchmark results. Validate against your own workload before relying on them.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to o3 Pro vs Mistral Small 3.1.
Frequently asked questions
Which is better, o3 Pro or Mistral Small 3.1?
o3 Pro and Mistral Small 3.1 target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is o3 Pro cheaper than Mistral Small 3.1?
Compare $0.0200 vs $0.00010 on this page.