GPT-5.5 vs Mistral Large 2
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
Updated
GPT-5.5 specs · Mistral Large 2 specs- PriceMistral Large 2
Mistral Large 2 publishes pricing ($6.00 / 1M output tokens) while GPT-5.5 does not.
- Context windowGPT-5.5
GPT-5.5 accepts 400K tokens vs 128K, 3.1× the room for long documents and codebases.
- BenchmarksTie
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.
- ModalitiesGPT-5.5
GPT-5.5 supports 3 modalities (text, vision, audio) vs 1 for Mistral Large 2.
- OpennessMistral Large 2
Mistral Large 2 ships open weights (Mistral Research License); GPT-5.5 is API-only.
It's a genuine coin-flip between GPT-5.5 and Mistral Large 2: 2 category wins each, with the rest tied. Mistral Large 2 publishes pricing ($6.00 / 1M output tokens) while GPT-5.5 does not. GPT-5.5 accepts 400K tokens vs 128K, 3.1× the room for long documents and codebases.
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. They differ in modality coverage, GPT-5.5 handles text, vision, audio while Mistral Large 2 handles text, which can be the deciding factor before you even look at benchmarks. Mistral Large 2 ships open weights (Mistral Research License); GPT-5.5 is API-only.
GPT-5.5 is the newer of the two, released 20 months after Mistral Large 2, which usually means a more recent knowledge cutoff and updated safety post-training. GPT-5.5 is usually picked for agents and tool use workloads, while Mistral Large 2 sees more deployments in coding llm and multilingual. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | GPT-5.5 | Mistral Large 2 |
|---|---|---|
| Provider | OpenAI | Mistral |
| Released | Mar 2026 | Jul 2024 |
| Modalities | text, vision, audio | text |
| Context window | 400K tokens | 128K tokens |
| Max output | , | , |
| Input · 1M | Pricing not published | $2.00 / 1M tokens |
| Output · 1M | Pricing not published | $6.00 / 1M tokens |
| Knowledge cutoff | , | 2024-04 |
| Open weights | No | Yes (Mistral Research License) |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day, vs $15.00
- Heavy usage, 1M in / 500k out per day, vs $150
- RAG workload, 5M in / 200k out per day, vs $336
Light usage, 100k in / 50k out per day: pricing not directly comparable (one or both models are missing public per-token rates). Heavy usage, 1M in / 500k out per day: pricing not directly comparable (one or both models are missing public per-token rates). RAG workload, 5M in / 200k out per day: pricing not directly comparable (one or both models are missing public per-token rates).
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- GPT-5.5Pricing unavailable
- Mistral Large 2$0.500
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
- MMLU,84.0
- HumanEval,92.0
GPT-5.5 fits when…
- Industry-leading tool-use and function-calling reliability
- Strong end-to-end agent performance across SWE-bench and GAIA
- Wide ecosystem support, ChatGPT, Realtime API, Responses API
- Long-context tasks, handles 400K tokens vs 128K for Mistral Large 2.
- Multimodal needs covering vision, audio.
Mistral Large 2 fits when…
- Strong code and math
- EU data residency
- Multilingual
- Self-hosting and on-prem requirements, open weights (Mistral Research License).
Consider GPT-5
OpenAI's unified flagship combining GPT-line breadth with built-in reasoning, replacing both GPT-4o and the o-series for most users.
Frequently asked
Is GPT-5.5 or Mistral Large 2 cheaper?
Per-token pricing isn't published for at least one of these models, check each model's spec page for current rates.Which has the larger context window?
GPT-5.5 accepts 400K tokens vs 128K for Mistral Large 2.Is GPT-5.5 or Mistral Large 2 better for coding?
Both GPT-5.5 and Mistral Large 2 are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Mistral Large 2 ships open weights (Mistral Research License). GPT-5.5 is API-only.When were GPT-5.5 and Mistral Large 2 released?
GPT-5.5 was released by OpenAI on 2026-03-01. Mistral Large 2 was released by Mistral on 2024-07-24.
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