GLM-5.3 vs. Claude Fable 5 on DeepSWE: Cost, Coding, and Routing
Together AI has introduced the GLM-5.3 model, which achieves parity with Claude Fable 5 on pass@1 benchmarks for DeepSWE. The model demonstrates superior pass@4 performance while reducing operational costs to $3.99 per rollout compared to $21.63 for Claude Fable 5.
Verified State Diff
Impact & Verification Analysis
Software engineers, AI infrastructure architects, and enterprise developers utilizing automated coding agents.
This release significantly alters the cost-to-performance ratio for automated software engineering workflows, allowing for more frequent or complex agentic iterations without proportional increases in compute expenditure.
Full Fact Overview
The benchmark analysis conducted over 904 DeepSWE rollouts indicates that GLM-5.3 provides a 5.4x cost reduction over Claude Fable 5. While both models exhibit identical pass@1 success rates, GLM-5.3 shows higher efficiency in multi-attempt (pass@4) coding scenarios, suggesting improved reasoning or code generation stability at a significantly lower price point per inference cycle.