Model Tracker
Leanstral 1.5
Leanstral 1.5 is an AI model made by Mistral AI. Mistral AI released it on 30 June 2026. It is retired. Mistral AI retired it on 30 September 2026.
Leanstral 1.5 is an AI model made by Mistral AI. Mistral AI released it on 30 June 2026. It is retired. Mistral AI retired it on 30 September 2026. Its context window is 256,000 tokens. Its longest answer is 128,000 tokens. Its weights are open. Its licence is Apache 2.0.
- Released
- 30 June 2026 — docs.mistral.ai, read 16 October 2026
- Status
- Retired — docs.mistral.ai, read 16 October 2026
- Retired
- 30 September 2026 — docs.mistral.ai, read 16 October 2026
- Takes
- Not confirmed: The model card shows a “Modalities” heading but gives no modality value; the maker's pages reviewed do not explicitly state the register's input modalities.
- Returns
- Not confirmed: The model card shows a “Modalities” heading but gives no modality value; the maker's pages reviewed do not explicitly state the register's output modalities.
- Open weights
- Yes — mistral.ai, read 16 October 2026
- Licence
- Apache 2.0 — docs.mistral.ai, read 16 October 2026
- Context window
- 256,000 tokens — docs.mistral.ai, read 16 October 2026
- Longest answer
- 128,000 tokens — docs.mistral.ai, read 16 October 2026
- Knowledge cutoff
- Not confirmed: The maker's model card and announcement do not state a knowledge cutoff.
- API price, input
- Not confirmed: The maker's pricing page does not list Leanstral 1.5 or state a standard input price per 1 million tokens; the announcement only describes its API as free, without a per-token price.
- API price, output
- Not confirmed: The maker's pricing page does not list Leanstral 1.5 or state a standard output price per 1 million tokens; the announcement only describes its API as free, without a per-token price.
- Where
- Not confirmed: two readings disagree: weights and api, weights
- Parameters
- 119,000,000,000 — docs.mistral.ai, read 16 October 2026
- Model card
- https://docs.mistral.ai/models/leanstral-1-5 — docs.mistral.ai, read 16 October 2026
Questions
When was Leanstral 1.5 released?
Mistral AI released Leanstral 1.5 on 30 June 2026.
Is Leanstral 1.5 still available?
No: Mistral AI retired Leanstral 1.5 on 30 September 2026.
What is the context window of Leanstral 1.5?
The context window of Leanstral 1.5 is 256,000 tokens, as Mistral AI prints it.
Are the weights of Leanstral 1.5 open?
Yes: Mistral AI publishes the weights of Leanstral 1.5 for download.
What is the licence of Leanstral 1.5?
The licence of Leanstral 1.5 is Apache 2.0, as Mistral AI names it.
How many parameters does Leanstral 1.5 have?
Leanstral 1.5 has 119,000,000,000 parameters, as Mistral AI publishes it.
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- Devstral Small 1.1
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- Leanstral
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- Magistral Medium 1.1
- Magistral Medium 1.2
- Magistral Small 1.0
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- Magistral Small 1.2
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- Mistral 7B
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Sources
- Leanstral 1.5 - Mistral AI | Mistral Docs (read 16 October 2026)
- Changelog (read 16 October 2026)
- Leanstral 1.5: Proof Abundance for All (read 16 October 2026)
- Model lifecycle policy (read 16 October 2026)
- Labs (read 16 October 2026)