Model comparison - Similar price, same tier
GPT-5.4 Mini vs Mistral Medium 3.5
GPT-5.4 Mini is from OpenAI and Mistral Medium 3.5 is from Mistral AI. On list price, Mistral Medium 3.5 charges 2x GPT-5.4 Mini's input price ($1.50 vs $0.75 per 1M tokens), and Mistral Medium 3.5 charges 1.7x GPT-5.4 Mini's output price ($7.50 vs $4.50 per 1M tokens). GPT-5.4 Mini has a 400,000-token context window and Mistral Medium 3.5 256,000 tokens; GPT-5.4 Mini returns up to 128,000 output tokens per response, and no primary source states a max output for Mistral Medium 3.5. GPT-5.4 Mini was released on March 17, 2026 and Mistral Medium 3.5 on April 27, 2026. Mistral Medium 3.5 publishes open weights (Modified MIT (https://huggingface.co/mistralai/Mistral-Medium-3.5-128B/blob/main/LICENSE)); GPT-5.4 Mini is closed-weights.
Last verified from each provider's pricing page. All sources
Side-by-side specs
| Spec | GPT-5.4 Mini | Mistral Medium 3.5 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Input / 1M tokens | $0.75 | $1.50 |
| Output / 1M tokens | $4.50 | $7.50 |
| Cache read / 1M | $0.075 | $0.15 |
| Batch input / 1M | $0.375 | $0.75 |
| Batch output / 1M | $2.25 | $3.75 |
| Context window | 400,000 | 256,000 |
| Max output | 128,000 | - |
| Release date | ||
| Weights | Closed | Open |
| License | - | Modified MIT (https://huggingface.co/mistralai/Mistral-Medium-3.5-128B/blob/main/LICENSE) |
| API model id | gpt-5.4-mini | mistral-medium-3-5 |
| AI Gateway id | openai/gpt-5.4-mini | mistral/mistral-medium-3.5 |
| Last verified |
Prices in USD per 1M tokens at each provider's standard first-party rate. A dash means the provider does not bill that item separately or no primary page states it.
What each costs in practice
The same three workloads every model page uses, worked from each model's standard list rates. Swap in your own token counts with the math on each model's page.
| Workload | GPT-5.4 Mini | Mistral Medium 3.5 |
|---|---|---|
| One agent session1M input tokens and 100K output tokens, no caching. | $1.20 | $2.25 |
| A chat app10,000 requests a day at 2K input and 500 output tokens each. | $37.50$1,125.00 per 30-day month | $67.50$2,025.00 per 30-day month |
| The same session at a 90% cache hit90% of the input is read from the prompt cache. The one-time cache write premium is not included. | $0.5925 | $1.04 |
Show the math
GPT-5.4 Mini
- One agent sessionInput: 1M x $0.75 = $0.75Output: 0.1M x $4.50 = $0.45
- A chat appInput: 20M x $0.75 = $15.00Output: 5M x $4.50 = $22.50
- The same session at a 90% cache hitCached input: 0.9M x $0.075 = $0.0675Uncached input: 0.1M x $0.75 = $0.075Output: 0.1M x $4.50 = $0.45
Mistral Medium 3.5
- One agent sessionInput: 1M x $1.50 = $1.50Output: 0.1M x $7.50 = $0.75
- A chat appInput: 20M x $1.50 = $30.00Output: 5M x $7.50 = $37.50
- The same session at a 90% cache hitCached input: 0.9M x $0.15 = $0.135Uncached input: 0.1M x $1.50 = $0.15Output: 0.1M x $7.50 = $0.75
Benchmarks under the same setting
No board in the benchmark directory lists both GPT-5.4 Mini and Mistral Medium 3.5 under the same setting, so there is no like-for-like score to show here.
Set them up in your tools
Step-by-step guides whose official docs list GPT-5.4 Mini or Mistral Medium 3.5 by model id.
- Use Mistral in AiderLists Mistral Medium 3.5
- Use Mistral in ClineLists Mistral Medium 3.5
- Use Mistral in ContinueLists Mistral Medium 3.5
- Use Mistral in GitHub CopilotLists Mistral Medium 3.5
- Use Mistral in GooseLists Mistral Medium 3.5
- Use Mistral in Kilo CodeLists Mistral Medium 3.5
- Use Mistral in OpenCodeLists Mistral Medium 3.5
- Use Mistral in Roo CodeLists Mistral Medium 3.5
- Use Mistral in ZedLists Mistral Medium 3.5
Model pages
FAQ
How do GPT-5.4 Mini and Mistral Medium 3.5 compare on price?
On list price, Mistral Medium 3.5 charges 2x GPT-5.4 Mini's input price ($1.50 vs $0.75 per 1M tokens), and Mistral Medium 3.5 charges 1.7x GPT-5.4 Mini's output price ($7.50 vs $4.50 per 1M tokens). For one agent session of 1M input and 100K output tokens with no caching, that is $1.20 on GPT-5.4 Mini and $2.25 on Mistral Medium 3.5. Prices are each provider's first-party list rates, verified October 17, 2026 and October 17, 2026.
What are the context windows of GPT-5.4 Mini and Mistral Medium 3.5?
GPT-5.4 Mini has a 400,000-token context window and Mistral Medium 3.5 256,000 tokens; GPT-5.4 Mini returns up to 128,000 output tokens per response, and no primary source states a max output for Mistral Medium 3.5.
Are GPT-5.4 Mini and Mistral Medium 3.5 open weights?
GPT-5.4 Mini is closed-weights and is called through OpenAI's API as gpt-5.4-mini. Mistral Medium 3.5's weights are published at huggingface.co under the Modified MIT (https://huggingface.co/mistralai/Mistral-Medium-3.5-128B/blob/main/LICENSE).
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Sources
GPT-5.4 Mini verified from developers.openai.com; Mistral Medium 3.5 verified from docs.mistral.ai. This page is as current as the older of the two: .
- https://developers.openai.com/api/docs/pricing
- https://docs.mistral.ai/inference/pricing
- https://developers.openai.com/api/docs/models/gpt-5.4-mini
- https://developers.openai.com/api/docs/changelog
- https://docs.mistral.ai/models/mistral-medium-3-5-26-04
- https://docs.mistral.ai/resources/changelogs
- https://huggingface.co/mistralai/Mistral-Medium-3.5-128B
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