Meta shipped three benchmark charts with Muse Code. Claude Opus 5 wins all three.

Meta launched its coding agent Muse Code alongside three benchmarks, and Claude Code paired with Opus 5 took first place on every one. On Terminal-Bench 2.1 it scored 86.7%, against 82.9% for Muse Code and 81.8% for Codex running GPT 5.6 Terra.

The gap widens on DeepSWE 1.1, where tasks run longer: Claude Code 65.0%, Codex 64.8%, Muse Code 59.3%. Even on Meta’s own internal benchmark, Opus 5 hit 79.4% versus 70.6% for Muse Spark 1.2.

Two caveats. Meta picked the mid-tier GPT 5.6 Terra as OpenAI’s entrant rather than the flagship Sol, and every bar measures a model-plus-agent combination, not the model alone.

Muse Code costs $1.25 per million input tokens and $4.25 per million output tokens, with $20 in credits at signup. Meta published the numbers on August 5, 2026, and nobody has independently verified them.