Fusion Launches in Devin Desktop & CLI

Fusion, the latest model harness for Fable 5.1 and Astra, achieves a 39% efficiency increase compared to existing alternatives. The new software tools, Devin Desktop and Devin CLI, provide access to Fusion's capabilities.

Devin Fusion operates at a cost of $7.90, which is 36% lower than Claude Code's $12.36 and 39% lower than Codex's $7.47, with Devin Fusion for Codex priced at $4.54. This positions Fusion as a cost-effective solution for AI model execution, particularly when compared to benchmarks like Fable 5.1 at $14.63 and Astra at $7.88.

The efficiency of Fable 5.1 is recorded at 63.4 with a cost of $2.34, while GPT-5.6 Luna shows 62.0 at $2.39. Fusion's introduction may lead practitioners to reconsider their model choices based on price per task rather than price per token, a shift expected to gain traction in 2026.

Partners Artificial Analysis and Vals AI are involved in evaluating Fusion's performance, which reportedly saves significant costs while maintaining frontier performance. This follows a trend in the industry towards more efficient and cost-effective AI solutions.