Mistral: Mistral Medium 3.5 vs OpenAI: GPT-5.6 Terra Pro
On input price, Mistral: Mistral Medium 3.5 is ~1.3× cheaper. Verified 2026-10-21.
Verdict
On blended price (3:1 input:output), Mistral: Mistral Medium 3.5 is ~1.5× cheaper ($1.50/$7.50 vs $2.00/$12.00 per 1M tokens). OpenAI: GPT-5.6 Terra Pro scores higher on intelligence (57 vs 30, Artificial Analysis) — pay more only if that gap matters for your workload.
Pricing
Per-million-token list prices, verified 2026-10-21. Green marks the better value.
| Metric | Mistral: Mistral Medium 3.5 | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| Input / 1M | $1.50 | $2.00 |
| Output / 1M | $7.50 | $12.00 |
| Cache read / 1M | — | $0.200 |
| Blended (3:1) | $3.00/1M | $4.50/1M |
| Estimated monthly cost | Mistral: Mistral Medium 3.5 | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| Chatbot10,000 reqs · 800/400 tok | $42.00 | $64.00 |
| Coding agent5,000 reqs · 8000/2000 tok | $135.00 | $200.00 |
| RAG pipeline30,000 reqs · 4000/500 tok | $292.50 | $420.00 |
Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.
Specifications & capabilities
| Metric | Mistral: Mistral Medium 3.5 | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| Context window | 262K | 1.1M |
| Max output | 210K | 128K |
| Vision input | ✓ | ✓ |
| Tool calling | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
Quality
Intelligence Index by Artificial Analysis (independent evaluations, 0–100).
Sources: Mistral: Mistral Medium 3.5 on Artificial Analysis · OpenAI: GPT-5.6 Terra Pro on Artificial Analysis
Performance
Measured by Artificial Analysis on live endpoints.
Speed measurements aren't available for both models yet.
Provider
Infrastructure metrics for the organizations behind these models.
| Metric | Mistral AI | OpenAI |
|---|---|---|
| Listed endpoints | 10 | 12 |
| Reliability | 99.5% | 99.9% |
| Avg latency | 400 ms | 450 ms |
| Pricing tiers | standard, free | standard, batch, provisioned |
Full details: Mistral: Mistral Medium 3.5 pricing · OpenAI: GPT-5.6 Terra Pro pricing