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Devstral Small 1.1

mistral/devstral-small

Devstral Small 1.1 is an Apache 2.0 open-source agentic coding model with 46.8% on SWE-bench Verified, built jointly by Mistral AI and All Hands AI.

Tool Use
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'mistral/devstral-small',
  prompt: 'Why is the sky blue?'
})

What To Consider When Choosing a Provider

  • Zero Data Retention

    AI Gateway supports Zero Data Retention for this model via direct gateway requests (BYOK is not included). To configure this, check the documentation.

    Authentication

    AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.

Devstral Small 1.1's Apache 2.0 license makes it among the more accessible open-source coding agents available through AI Gateway.

When to Use Devstral Small 1.1

Best For

  • OpenHands or SWE-agent backend:

    Teams using these scaffolds need a compact backend model

  • GitHub issue resolution prototypes:

    Early-stage exploration of automated issue-resolution pipelines

  • Apache 2.0 licensing requirement:

    Projects that mandate an Apache 2.0 open-weight license

Consider Alternatives When

  • Higher SWE-bench accuracy:

    You need a stronger score (consider Devstral 2)

  • Multimodal input capabilities:

    Your agent requires image or other non-text input

  • Reasoning-first approach:

    Your task needs reasoning rather than agentic code execution

Conclusion

Devstral Small 1.1 brought agentic software engineering to a compact open-weight model. Devstral Small 1.1's GitHub-issue training, Apache 2.0 license, and broad deployment ecosystem make it a practical choice for teams exploring AI-assisted code maintenance.

FAQ

Mistral AI and All Hands AI, the team behind the OpenHands agentic framework, built it together.

46.8%, which exceeded all prior open-source models by more than 6 percentage points.

OpenHands and SWE-Agent are explicitly supported, and Devstral Small 1.1's tool-use capabilities make it compatible with other scaffolds as well.

Pricing appears on this page and updates as providers adjust their rates. AI Gateway routes traffic through the configured provider.

Devstral Small 2 is the successor with improved SWE-bench scores (68.0%), a 256K context window, and multimodal (image) input support. Devstral Small 1.1 remains relevant for teams already using it or preferring its established ecosystem integrations.