GPT-5.5 Pro vs Mistral Medium 3.5
| Signal | GPT-5.5 Pro | Delta | Mistral Medium 3.5 |
|---|---|---|---|
Capabilities | 100 | +17 | |
Benchmarks | 92 | +21 | |
Pricing | 5 | -87 | |
Context window size | 96 | +10 | |
Recency | 100 | -- | |
Output Capacity | 85 | +65 | |
| Overall Result | 4 wins | of 6 | 1 wins |
Score History
92.7
current score
GPT-5.5 Pro
right now
71.7
current score
GPT-5.5 Pro
OpenAI
Mistral Medium 3.5
Mistral AI
Mistral Medium 3.5 saves you $11475.00/month
That's $137700.00/year compared to GPT-5.5 Pro at your current usage level of 100K calls/month.
| Metric | GPT-5.5 Pro | Mistral Medium 3.5 | Winner |
|---|---|---|---|
| Overall Score | 93 | 72 | GPT-5.5 Pro |
| Rank | #11 | #153 | GPT-5.5 Pro |
| Quality Rank | #11 | #153 | GPT-5.5 Pro |
| Adoption Rank | #11 | #153 | GPT-5.5 Pro |
| Parameters | -- | -- | -- |
| Context Window | 1050K | 262K | GPT-5.5 Pro |
| Pricing | $30.00/$180.00/M | $1.50/$7.50/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 83 | GPT-5.5 Pro |
| Benchmarks | 92 | 70 | GPT-5.5 Pro |
| Pricing | 5 | 93 | Mistral Medium 3.5 |
| Context window size | 96 | 86 | GPT-5.5 Pro |
| Recency | 100 | 100 | GPT-5.5 Pro |
| Output Capacity | 85 | 20 | GPT-5.5 Pro |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 93/100 (rank #11), placing it in the top 97% of all 290 models tracked.
Scores 72/100 (rank #153), placing it in the top 48% of all 290 models tracked.
GPT-5.5 Pro has a 21-point advantage, which typically translates to noticeably stronger performance on complex reasoning, code generation, and multi-step tasks.
Choose GPT-5.5 Pro when you need:
- Processing long documents or large codebases (1050K token context)
- Step-by-step reasoning and chain-of-thought problem solving
Choose Mistral Medium 3.5 when you need:
- High-volume production workloads where API costs must be minimized
- Step-by-step reasoning and chain-of-thought problem solving
Mistral Medium 3.5 offers 96% better value per quality point. At 1M tokens/day, you'd spend $135.00/month with Mistral Medium 3.5 vs $3150.00/month with GPT-5.5 Pro - a $3015.00 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. Mistral Medium 3.5 also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (1050K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($7.50/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (93/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
GPT-5.5 Pro clearly outperforms Mistral Medium 3.5 with a significant 21-point lead. For most general use cases, GPT-5.5 Pro is the stronger choice. However, Mistral Medium 3.5 may still excel in niche scenarios.
By Use Case
Best for Quality
GPT-5.5 Pro
Marginally better benchmark scores; both are excellent
Best for Cost
Mistral Medium 3.5
96% lower pricing; better value at scale
Best for Reliability
GPT-5.5 Pro
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.5 Pro
Stronger community support and better developer experience
Best for Production
GPT-5.5 Pro
Wider enterprise adoption and proven at scale
by OpenAI
- Choose for Quality - Marginally better benchmark scores; both are excellent
- Choose for Reliability - Higher uptime and faster response speeds
- Choose for Prototyping - Stronger community support and better developer experience
- Choose for Production - Wider enterprise adoption and proven at scale
| Capability | GPT-5.5 Pro | Mistral Medium 3.5 |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Searchdiffers | ||
| Image Output |
GPT-5.5 Pro
OpenAI
Mistral Medium 3.5
Mistral AI
Mistral Medium 3.5 saves you $258.30/month
That's 96% cheaper than GPT-5.5 Pro at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | GPT-5.5 Pro | Mistral Medium 3.5 |
|---|---|---|
| Context Window | 1.1M | 262K |
| Max Output Tokens | 128,000 | -- |
| Open Source | No | No |
| Created | Apr 24, 2026 | Apr 30, 2026 |