GPT-5.5
GLM-5.1
Decision Recommendation
⚖️ Editorial Verdict: In our analysis, GPT-5.5 is the premium intelligence choice, scoring 0.2% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: GLM-5.1 is 7.5x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GLM-5.1 offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GPT-5.5 fully justifies the cost.
GPT-5.5
Benchmarks & Scores
Cost & Performance
GLM-5.1
Benchmarks & Scores
Cost & Performance
Frequently Asked Questions
GLM-5.1 is cheaper than GPT-5.5. GLM-5.1 has a blended cost of $1.50/1M tokens, which is about 7.5x cheaper than GPT-5.5 at $11.25/1M tokens.
Speed data is not available for GLM-5.1, while GPT-5.5 generates 72.7 tokens per second.
GPT-5.5 is better for coding tasks. It scores 58.6% on coding evaluations (swe-bench-pro) compared to GLM-5.1 which scores 58.4%.
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