Claude Opus 4.8 vs GLM-5.1
Claude Opus 4.8 (Anthropic) and GLM-5.1 (Z.ai (Zhipu AI)) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Opus 4.8 leads on overall intelligence (ECI 157 vs 150).
- GLM-5.1 is cheaper on input tokens — $0.98 vs $5.00 per 1M.
- Claude Opus 4.8 has a larger context window (1M vs 203K tokens).
- Claude Opus 4.8 ranks higher for coding (96th vs 69th percentile).
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Claude Opus 4.8 better than GLM-5.1?
On Epoch AI's Capabilities Index, Claude Opus 4.8 scores higher (157) than GLM-5.1 (150). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Opus 4.8 or GLM-5.1?
GLM-5.1 is cheaper on input tokens at $0.98 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Opus 4.8 or GLM-5.1?
Claude Opus 4.8 supports up to 1M tokens, compared with 203K for the other.
Which is better for coding, Claude Opus 4.8 or GLM-5.1?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Claude Opus 4.8 ranks higher — 96th vs 69th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.