GPT-5.5 Pro
GLM-5.1
Decision Recommendation
⚖️ Editorial Verdict: In our analysis, GLM-5.1 is the premium intelligence choice, scoring 58.4% higher on coding benchmarks. However, GPT-5.5 Pro compensates by delivering 1.0x faster throughput. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, GPT-5.5 Pro offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GLM-5.1 fully justifies the cost.
GPT-5.5 Pro
Benchmarks & Scores
Cost & Performance
GLM-5.1
Benchmarks & Scores
Cost & Performance
Frequently Asked Questions
GLM-5.1 is cheaper than GPT-5.5 Pro. GLM-5.1 has a blended cost of $1.50/1M tokens, which is about 44.9x cheaper than GPT-5.5 Pro at $67.50/1M tokens.
Speed data is not available for GLM-5.1, while GPT-5.5 Pro generates 74 tokens per second.
GLM-5.1 is better for coding tasks. It scores 58.4% on coding evaluations (swe-bench-pro) compared to GPT-5.5 Pro which scores N/A.
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