Lesson 90 of 1570
Mistral Codestral 25 — code-specific model
Codestral 25 is Mistral's dedicated coding model. Small, fast, and cheap enough to run as an inline autocomplete.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1Built for IDEs, not chats
- 2Codestral 25
- 3code completion
- 4FIM
Concept cluster
Terms to connect while reading
Section 1
Built for IDEs, not chats
Codestral 25 supports fill-in-the-middle (FIM) out of the box and is priced to run on every keystroke of a paying developer. That is a different class of tool than a chat assistant.
- Native FIM API for inline completions
- 80+ languages at usable quality
- Available via Mistral API and self-hosted
- Continue, Tabby, and Zed integrations ship with it as an option
Compare the options
| Feature | Codestral 25 | Claude Sonnet 4.6 |
|---|---|---|
| FIM support | Native | Workaround |
| Latency per completion | <500ms | 1-2s |
| Cost per M tokens | Very low | Moderate |
| Best fit | Inline completion | Chat + agent |
FIM endpoint takes a prefix and suffix; the model fills the gap.
resp = client.fim.complete(
model="codestral-latest",
prompt="def parse_csv(path):\n ",
suffix="\n return rows",
)Pair it, do not replace Claude
Codestral 25 excels at completions; it underperforms chat-tier models on multi-step refactors and natural-language explanations. Use it for inline suggestions and route chat to Sonnet or GPT-5.
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