Head-to-head · Updated Nov 3, 2026
Mistral vs ChatGPT
The highest-scoring Mistral and ChatGPT models, Mistral Large 4 and GPT-6 Astra, on independent tests for professional work, cost and speed.
Short answer
GPT-6 Astra leads on 8 of 9 quality scores, including the overall Intelligence Index.
- FinanceGPT-6 Astra57.4 vs 39.1
- Legal workGPT-6 Astra55.6 vs 34.6
- EngineeringGPT-6 Astra61.8 vs 33.3
- Strategy & operationsGPT-6 Astra58.0 vs 43.3
- Coding agentsGPT-6 Astra59.1% vs 24.7%
- Fewer made-up answersMistral Large 428.2% vs 49.8%
- Lower costMistral Large 4$1,359 vs $5,661
Scores, cost and speed
| Measure | Mistral Large 4 (High) | GPT-6 Astra (Max) |
|---|---|---|
| Overall | ||
| Intelligence IndexCombined score across nine evaluations | 26.0 | Leads: 56.9 |
| Professional work | ||
| Finance & accounting | 39.1 | Leads: 57.4 |
| Legal | 34.6 | Leads: 55.6 |
| Healthcare & medical | — | 53.7 |
| Engineering | 33.3 | Leads: 61.8 |
| Strategy & operations | 43.3 | Leads: 58.0 |
| Economics | 36.9 | Leads: 58.3 |
| Specific tests | ||
| Terminal-Bench 4.0Agentic coding tasks | 24.7% | Leads: 59.1% |
| FrontierCode 2.0Hard programming problems | 15.0% | Leads: 42.4% |
| Humanity’s Last ExamExpert-level questions | — | 54.7% |
| HealthBenchHealth conversations graded by physicians’ rubrics | — | 58.2% |
| GDPval-AAKnowledge-work deliverables, Elo | — | 1584 |
| Hallucination rateAA-Omniscience; lower is better | Leads: 28.2% | 49.8% |
| Cost & speed | ||
| Input priceUS$ per 1M tokens | Leads: $0.70 | $10 |
| Output priceUS$ per 1M tokens | Leads: $2.10 | $50 |
| Cost to run the indexUS$, includes reasoning tokens | Leads: $1,359 | $5,661 |
| Output speedMedian tokens per second | — | 73 tok/s |
| Context windowTokens | 1M | 1M |
Scores, prices and speeds: Artificial Analysis, independently measured, checked Nov 3, 2026. Model names include the tested reasoning setting. Stubbi has not rerun these evaluations. Consumer apps such as ChatGPT, Claude and Gemini may use other models and add features like search and memory.
All measured Mistral and ChatGPT models
| Model and setting | Released | Index | Price in / out |
|---|---|---|---|
| GPT-6 Astra (Max)OpenAI | Sep 2026 | 56.9 | $10 / $50 |
| GPT-6.1 Sol (Max)OpenAI | Sep 2026 | 54.5 | $2 / $10 |
| GPT-6.1 Terra (Max)OpenAI | Oct 2026 | 51.0 | $1 / $5 |
| GPT-6 Luna (Max)OpenAI | Sep 2026 | 27.8 | $0.10 / $0.50 |
| Mistral Large 4 (High)Mistral | Oct 2026 | 26.0 | $0.70 / $2.10 |
Test them on your own work
Public scores can’t show how each model handles your documents, clients or standards. Tell us the task, and we’ll consider a side-by-side comparison with the outputs you can judge.