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Cognition Adds Claude Haiku 5.5 to Devin as a Lower-Cost Coding Sidekick

October 7, 2026 at 17:18 EDT

Software Dev & Coding
AI Agents
Foundation Models

Cognition has made Claude Haiku 5.5 available in Devin, positioning Anthropic's newest small model as a lower-cost option for coding-agent work and as a sidekick inside Devin Fusion. The company says Haiku 5.5 reaches 58.4% on FrontierCode 1.1 in Devin, ahead of Claude Sonnet 5 while costing about one-eighth as much per task.

Oct. 7, 2026 · Cognition

Haiku 5.5 joins Devin

Claude Haiku 5.5 is now available in Devin, with Cognition presenting it as a lower-cost coding model and a Fusion sidekick for Opus 5.5-led sessions.

58.4%

FrontierCode 1.1 score in Devin

1/8

Approximate task cost versus Sonnet 5

Token context window

Task-cost comparison

Haiku 5.51 unit

Sonnet 5~8 units

Cognition says Haiku 5.5 beats Sonnet 5 on FrontierCode 1.1 at about one-eighth the task cost.

How Fusion uses the model

Lead model

Plans, resolves ambiguity and reviews the work.

→

Haiku sidekick

Explores code, edits files, runs tests and reports back.

→

Review loop

The lead keeps control when the task gets harder.

Best fit

High-volume, latency-sensitive and delegated coding work where lower task cost matters.

Limitation

Larger Claude models remain better suited to complex agentic coding tasks.

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