Mistral Medium 3.5 128B vs o3
At a Glance
| Compare |  Mistral Medium 3.5 128BMistral AI |  o3OpenAI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $1.00Openrouter ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $4.00Openrouter ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 262K | 200K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Mistral-Medium-3.5-128B | o3 |
|---|---|---|
| Developer | Mistral AI | OpenAI |
| Family | Mistral Medium 3 5 128b | O3 |
| Model | Mistral-Medium-3.5-128B | o3 |
| Version | Mistral-Medium-3.5-128B | o3 |
| Lifecycle | active | active |
| Released | Unknown | 2025-04-16 |
| Knowledge cutoff | Unknown | 2024-06-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 262K | 200K |
| Total parameters | 127.7B | Unknown |
| Active parameters | Unknown | Unknown |
| License | other | Unknown |
| Open weights | Yes | No |
| API available | Unknown | Yes |
| Self-hostable | Yes | No |
| Provider access | Unknown | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, structured_outputs, tools |
Mistral Medium 3.5 128B Capabilities
o3 Capabilities
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Primary Evidence
Sources and Freshness
Questions
Mistral Medium 3.5 128B vs o3 FAQs
Is Mistral Medium 3.5 128B or o3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Mistral Medium 3.5 128B and o3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Mistral Medium 3.5 128B or o3?+
Only o3 has a directly sourced input price: $1.00 per million tokens. Only o3 has a directly sourced output price: $4.00 per million tokens.
Which has a larger context window, Mistral Medium 3.5 128B or o3?+
Mistral Medium 3.5 128B has the larger sourced context window. Mistral Medium 3.5 128B supports 262K and o3 supports 200K.
Which performs better in benchmarks, Mistral Medium 3.5 128B or o3?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Mistral Medium 3.5 128B or o3 be self-hosted?+
Mistral Medium 3.5 128B is the only model in this pair currently marked as self-hostable. Mistral Medium 3.5 128B is open weight; o3 is not marked open weight.
Can Mistral Medium 3.5 128B and o3 understand images?+
Mistral Medium 3.5 128B is documented with image input; o3 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Mistral Medium 3.5 128B or o3?+
Neither has a larger sourced maximum output. Mistral Medium 3.5 128B is — and o3 is 100K.
Do Mistral Medium 3.5 128B and o3 support reasoning and tool use?+
Mistral Medium 3.5 128B: reasoning, tool calling, and image input. o3: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Mistral Medium 3.5 128B or o3?+
Mistral Medium 3.5 128B has 0 sourced provider routes; o3 has 2, so o3 has broader tracked availability.
Which offers better value, Mistral Medium 3.5 128B or o3?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.