Mistral Medium 3.5 128B vs GPT-6 Astra
At a Glance
| Compare |  Mistral Medium 3.5 128BMistral AI |  GPT-6 AstraOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | UnrankedNot in the 46-model eligible cohort | #6 of 4684.4 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | UnrankedNot in the 44-model eligible cohort | #41 of 44$0.520 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.5 | UnrankedNot in the 38-model eligible cohort | #27 of 3849.2 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $10.00Openai ↗ · Sep 4, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $50.00Openai ↗ · Sep 4, 2026 |
| Context windowMaximum documented tokens | 262K | 1,050K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 4, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Mistral-Medium-3.5-128B | GPT-6 Astra |
|---|---|---|
| LMArena Agent Arenaagent-2026-09-15-d25aabda0010 · outcome_score · leader | -10.8880% of row best · score · Mistral Medium 3.5; 95% CI [-12.33636331, -9.41760729]; sessions 10244; observations 358935; rank 43 | 11.54100% of row best · score · GPT 6 Astra (Max); 95% CI [9.43393746, 13.63932109]; sessions 10372; observations 782334; rank 2 |
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,420.5898% of row best · rating · mistral-medium-3.5; 95% CI [1414.04225396, 1427.11615611]; votes 10996; rank 104 | 1,443.72100% of row best · rating · gpt-6-astra-max; 95% CI [1432.08094427, 1455.36783662]; votes 2693; rank 59 |
| LMArena Vision Arenavision-2026-09-13-d25aabda0010 · arena_rating · leader | 1,222.0596% of row best · rating · mistral-medium-3.5; 95% CI [1212.30064904, 1231.79518832]; votes 5090; rank 71 | 1,278.58100% of row best · rating · gpt-6-astra-max; 95% CI [1261.64778832, 1295.50325714]; votes 1367; rank 30 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark winsNo overall winner | 3 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Mistral-Medium-3.5-128B | GPT-6 Astra |
|---|---|---|
| Developer | Mistral AI | OpenAI |
| Family | Mistral Medium 3 5 128b | Gpt 6 |
| Model | Mistral-Medium-3.5-128B | GPT-6 Astra |
| Version | Mistral-Medium-3.5-128B | GPT-6 Astra |
| Lifecycle | active | active |
| Released | Unknown | 2026-09-03 |
| Knowledge cutoff | Unknown | 2026-04-30 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 262K | 1,050K |
| Total parameters | 127.7B | Unknown |
| Active parameters | Unknown | Unknown |
| License | other | Unknown |
| Open weights | Yes | No |
| API available | Unknown | Yes |
| Self-hostable | Yes | No |
| Provider access | Unknown | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, computer-use, generation, reasoning, research, tools |
Mistral Medium 3.5 128B Capabilities
GPT-6 Astra Capabilities
Related Comparisons
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|---|---|---|---|
Mistral-Medium-3.5-128BMistral AI | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Mistral-Medium-3.5-128BMistral AI | cross-developer peersimage, text |
 Gemini 3.1 ProGoogle DeepMind | vs | Mistral-Medium-3.5-128BMistral AI | cross-developer peerstext |
 DeepSeek-V4.1-FlashDeepSeek | vs | Mistral-Medium-3.5-128BMistral AI | cross-developer peersimage, text |
Mistral-Medium-3.5-128BMistral AI | vs | Grok 4.6xAI | cross-developer peersimage, text |
Mistral-Medium-3.5-128BMistral AI | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Mistral-Medium-3.5-128BMistral AI | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Mistral-Medium-3.5-128BMistral AI | cross-developer peersimage, text |
Mistral-Medium-3.5-128BMistral AI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Mistral-Medium-3.5-128BMistral AI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | Mistral-Medium-3.5-128BMistral AI | cross-developer peersimage, text |
Mistral-Medium-3.5-128BMistral AI | vs | Mistral Large 3Mistral AI | family variantsimage, text |
Primary Evidence
Sources and Freshness
Questions
Mistral Medium 3.5 128B vs GPT-6 Astra FAQs
Is Mistral Medium 3.5 128B or GPT-6 Astra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Mistral Medium 3.5 128B and GPT-6 Astra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Mistral Medium 3.5 128B or GPT-6 Astra?+
Only GPT-6 Astra has a directly sourced input price: $10.00 per million tokens. Only GPT-6 Astra has a directly sourced output price: $50.00 per million tokens.
Which has a larger context window, Mistral Medium 3.5 128B or GPT-6 Astra?+
GPT-6 Astra has the larger sourced context window. Mistral Medium 3.5 128B supports 262K and GPT-6 Astra supports 1,050K.
Which performs better in benchmarks, Mistral Medium 3.5 128B or GPT-6 Astra?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Mistral Medium 3.5 128B or GPT-6 Astra be self-hosted?+
Mistral Medium 3.5 128B is the only model in this pair currently marked as self-hostable. Mistral Medium 3.5 128B is open weight; GPT-6 Astra is not marked open weight.
Can Mistral Medium 3.5 128B and GPT-6 Astra understand images?+
Mistral Medium 3.5 128B is documented with image input; GPT-6 Astra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Mistral Medium 3.5 128B or GPT-6 Astra?+
Neither has a larger sourced maximum output. Mistral Medium 3.5 128B is — and GPT-6 Astra is 128K.
Do Mistral Medium 3.5 128B and GPT-6 Astra support reasoning and tool use?+
Mistral Medium 3.5 128B: reasoning, tool calling, and image input. GPT-6 Astra: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Mistral Medium 3.5 128B or GPT-6 Astra?+
Mistral Medium 3.5 128B has 0 sourced provider routes; GPT-6 Astra has 2, so GPT-6 Astra has broader tracked availability.
Which offers better value, Mistral Medium 3.5 128B or GPT-6 Astra?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.