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GPT-6 Astra vs Mistral Large
A straight cost comparison of GPT-6 Astra (OpenAI) and Mistral Large (Mistral AI), per 1,000,000 tokens, verified November 2026.
Rate-by-rate comparison
| Metric | GPT-6 Astra | Mistral Large | Winner |
|---|---|---|---|
| Input / 1M | $10 | $2 | Mistral Large |
| Cached input / 1M | $1 | $0.20 | Mistral Large |
| Cache write / 1M | $12.50 |  | Mistral Large |
| Output / 1M | $50 | $6 | Mistral Large |
| Context window | 1,050,000 | 128,000 | GPT-6 Astra |
| Batch API | Yes | Yes | Tie |
| Long-context tier | > 272,000 | None |  |
For per-token metrics, the lower number wins. For context window and batch support, the higher or broader option wins. A dash means the provider does not publish that rate: a missing cache-write fee means writes are not billed per token, while a missing cached-input rate means cache hits bill at the full input rate.
Blended cost: 1M input + 250K output
| Model | Blended cost | Difference |
|---|---|---|
| GPT-6 Astra | $22.50 | +$19 |
| Mistral Large | $3.50 | Cheaper |
Ten workloads, two bills
The same two models, priced across ten workloads that differ only in their input:output ratio. Nothing else changes  no retries, no system prompt, no middleware.
| Workload | GPT-6 Astra | Mistral Large | Winner |
|---|---|---|---|
| Classification 100K reqs · 500 in / 10 out | $550 | $106 | Mistral Large |
| Data extraction 10K reqs · 2K in / 200 out | $300 | $52 | Mistral Large |
| Support chat 1K reqs · 4K in / 600 out | $70 | $11.60 | Mistral Large |
| Code review 2K reqs · 8K in / 1.5K out | $310 | $50 | Mistral Large |
| Summarisation 1K reqs · 20K in / 1K out | $250 | $46 | Mistral Large |
| Agent loop 5K reqs · 12K in / 2K out | $1,100 | $180 | Mistral Large |
| Translation 500 reqs · 15K in / 15K out | $450 | $60 | Mistral Large |
| Long-document QA 200 reqs · 120K in / 800 out | $248 | $48.96 | Mistral Large |
| Cached RAG 1K reqs · 50K in (45K cached) / 1K out | $146 | $25.08 | Mistral Large |
| Nightly batch 10K reqs · 10K in / 2K out | $1,000 | $160 | Mistral Large |
GPT-6 Astra wins 0 of 10, Mistral Large wins 10 of 10. The winner is set by the token mix, not by the headline rate.
Where the two bills cross over
Mistral Large is cheaper on both sides of the mix: $2 vs $10 per million input tokens, and $6 vs $50 per million output. No input:output ratio reverses that, so on price alone the other model never becomes the better choice  it has to win on context, latency or output quality.
Cost at four scales
The same support-chat workload (4K input, 600 output per request) at four monthly volumes.
| Requests / month | GPT-6 Astra | Mistral Large | Difference |
|---|---|---|---|
| 100 | $7 | $1.16 | Mistral Large cheaper by $5.84 |
| 1,000 | $70 | $11.60 | Mistral Large cheaper by $58.40 |
| 10,000 | $700 | $116 | Mistral Large cheaper by $584 |
| 100,000 | $7,000 | $1,160 | Mistral Large cheaper by $5,840 |
What caching does to each bill
Caching only helps the part of the prompt that repeats. This is the support-chat workload (1,000 requests, 4,000 input tokens each) with an increasing share of that prompt served from a warm cache, written once on the first request.
| Cached share of the prompt | GPT-6 Astra | Mistral Large | Winner |
|---|---|---|---|
| 0% | $70 | $11.60 | Mistral Large |
| 50% | $52.02 | $8 | Mistral Large |
| 80% | $41.24 | $5.85 | Mistral Large |
| 95% | $35.84 | $4.77 | Mistral Large |
Both models publish a cached-read rate, so the discount is comparable: GPT-6 Astra reads cache at $1 per million, Mistral Large at $0.20.
Which one should you pick?
GPT-6 Astra wins on none of the ten workloads above, while Mistral Large wins on classification, data extraction, support chat, code review, summarisation, agent loop, translation, long-document qa, cached rag, nightly batch.
Beyond price, the two differ on input rate ($10 vs $2); output rate ($50 vs $6); cached-input rate ($1 vs $0.20); cache-write rate ($12.50 vs â€â€); context window (1,050,000 vs 128,000); long-context tier (yes, above 272,000 vs none).
Batch mode is available on GPT-6 Astra and Mistral Large, which halves the nightly job. Both publish cached-input discounts, so a stable system prompt is worth caching on either.
FAQ
Is GPT-6 Astra cheaper than Mistral Large?
On a blended 1M-input-plus-250K-output workload, Mistral Large is cheaper by 84% ($3.50 vs $22.50). The gap changes for cache-heavy prompts and for batch jobs, as the workload table shows.
Which handles longer prompts, GPT-6 Astra or Mistral Large?
Mistral Large has the larger context window (1,050,000 vs 128,000 tokens). Watch the long-context threshold on GPT-6 Astra: rates rise once input passes it.
Do both models support prompt caching?
GPT-6 Astra bills cached reads at $1 per 1M; Mistral Large at $0.20.
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