GPT-5.5 Pro vs Mistral Large 4
GPT-5.5 Pro and Mistral Large 4 are closely matched at 45.5 and 46.2 on the LLM Stats Score. Mistral Large 4 is 65.4x cheaper per token.
OpenAI · Mistral AI · Updated for 2026
Which is better?
GPT-5.5 Pro and Mistral Large 4 are closely matched on the overall LLM Stats Score at 45.5 and 46.2.
On price, Mistral Large 4 is roughly 65.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 Pro also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.5 Pro
- you process long inputs — it offers a 1,050,000 token context window
Choose Mistral Large 4
- cost matters — it's about 65.4x cheaper per token
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Individual benchmarks
5 reported for GPT-5.5 Pro · 18 for Mistral Large 4
GPT-5.5 Pro and Mistral Large 4don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.5 Pro ($30.00/1M tokens) is 44.1x more expensive than Mistral Large 4 ($0.68/1M tokens).
For output processing, GPT-5.5 Pro ($180.00/1M tokens) is 86.1x more expensive than Mistral Large 4 ($2.09/1M tokens).
In conclusion, GPT-5.5 Pro is more expensive than Mistral Large 4.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.5 Pro accepts 1,050,000 input tokens compared to Mistral Large 4's 1,000,000 tokens. Only GPT-5.5 Pro specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Both GPT-5.5 Pro and Mistral Large 4 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5 Pro
Mistral Large 4
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.5 Pro was released on 2026-04-23, while Mistral Large 4 was released on 2026-10-06.
Mistral Large 4 is 6 months newer than GPT-5.5 Pro.
Apr 23, 2026
5 months ago
Oct 6, 2026
2 days ago
5mo newerKnowledge Cutoff
When training data ends
GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Mistral Large 4's cutoff date is not specified.
We can confirm GPT-5.5 Pro's training data extends to 2025-12-01, but cannot make a direct comparison without Mistral Large 4's cutoff date.
Dec 2025
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Provider Availability
GPT-5.5 Pro is available from OpenAI. Mistral Large 4 is available from Mistral AI.
GPT-5.5 Pro
Mistral Large 4
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.5 Pro and Mistral Large 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.5 Pro vs Mistral Large 4.