Model comparison
GLM-5.2 vs GPT-5.5 Pro
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GLM-5.2 #37 (Estimated); GPT-5.5 Pro #38 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GLM-5.2 and GPT-5.5 Pro share 3 comparable benchmark results. 3 of 8 categories are comparable. 40 results are unique to GLM-5.2; 4 to GPT-5.5 Pro.
Updated July 23, 2026- Shared results
- 3
- GLM-5.2 only
- 40
- GPT-5.5 Pro only
- 4
- Comparable categories
- 3 / 8
Pick GLM-5.2 if you want the stronger benchmark profile. GPT-5.5 Pro only becomes the better choice if agentic is the priority.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GLM-5.2 has the cleaner BenchAlign overall profile here, landing at 63.96 versus 63.69. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
GLM-5.2's sharpest advantage is in mathematics, where it averages 95.9 against 48.1. The single biggest benchmark swing on the page is HLE, 54.7% to 57.2%. GPT-5.5 Pro does hit back in agentic, so the answer changes if that is the part of the workload you care about most.
GPT-5.5 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $1.40 input / $4.40 output per 1M tokens for GLM-5.2. That is roughly 40.9x on output cost alone.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GLM-5.2 | Δ | GPT-5.5 Pro |
|---|---|---|---|
| Math | GLM-5.295.9 | Margin← 47.8 | GPT-5.5 Pro48.1 |
| Agentic | GLM-5.281.0 | Margin→ 9.1 | GPT-5.5 Pro90.1 |
| Knowledge | GLM-5.259.6 | Margin← 2.4 | GPT-5.5 Pro57.2 |
| Coding | GLM-5.262.1 | MarginNo overlap | GPT-5.5 ProNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
HLE
KnowledgeA 54.7%B 57.2%Winner: GPT-5.5 ProΔ 2.5HLE: GLM-5.2 scored 54.7%; GPT-5.5 Pro scored 57.2%. GPT-5.5 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GLM-5.2 | GPT-5.5 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GLM-5.2$1.4 input / $4.4 output | GPT-5.5 Pro$30 input / $180 output | GLM-5.2 has the lower combined listed price. |
| Generation speedtokens per second | GLM-5.2Not available | GPT-5.5 ProNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GLM-5.2Not available | GPT-5.5 ProNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GLM-5.21M | GPT-5.5 Pro1M | Listed context windows are equal. |
Benchmark Deep Dive
AgenticGPT-5.5 Pro wins18 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 81% | — | Not comparable |
| MCP AtlasSource | 76.8% | — | Not comparable |
| ToolathlonSource | 48.2% | — | Not comparable |
| AA Agentic IndexSource | 43.1% | — | Not comparable |
| τ²-bench resultsSource | 99.1% | — | Not comparable |
| GDPval-AASource | 50.7% | — | Not comparable |
| GDPval-AASource | 1514 | — | Not comparable |
| APEX-Agents-AASource | 33.7% | — | Not comparable |
| ResearchClawBenchSource | 20.7% | — | Not comparable |
| AA BriefcaseSource | 1260 | — | Not comparable |
| AA AutomationBenchSource | 27.8% | — | Not comparable |
| AA EnterpriseOps-GymSource | 42.7% | — | Not comparable |
| AA Harvey LABSource | 91.0% | — | Not comparable |
| AA ITBenchSource | 42.7% | — | Not comparable |
| AA Tau3 BankingSource | 26.8% | — | Not comparable |
| terminalBenchHardSource | 50.8% | — | Not comparable |
| aaTerminalBench21Source | 77.9% | — | Not comparable |
| BrowseCompSource | — | 90.1% | Not comparable |
Coding7 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| SWE-bench ProSource | 62.1% | — | Not comparable |
| NL2RepoSource | 48.9% | — | Not comparable |
| Terminal-Bench 2.0Source | 81.0% | — | Not comparable |
| ProgramBenchSource | 63.7% | — | Not comparable |
| cursorBench32Source | 55.0% | — | Not comparable |
| AA Coding IndexSource | 68.8% | — | Not comparable |
| AA-SciCodeSource | 50.5% | — | Not comparable |
Reasoning2 benchmarks
KnowledgeGLM-5.2 wins11 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| GPQASource | 91.2% | — | Not comparable |
| GPQA-DSource | 91.2% | — | Not comparable |
| HLESource | 54.7% | 57.2% | GPT-5.5 Pro leads |
| HLE w/o toolsSource | 40.5% | 43.1% | GPT-5.5 Pro leads |
| Artificial Analysis Intelligence IndexSource | 51.1% | — | Not comparable |
| AA-GPQA DiamondSource | 89.5% | — | Not comparable |
| AA-HLESource | 40.1% | — | Not comparable |
| AA-Omniscience IndexSource | 4.0% | — | Not comparable |
| AA-Omniscience AccuracySource | 25.1% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 28.1% | — | Not comparable |
| AA Openness IndexSource | 44.4% | — | Not comparable |
MathGLM-5.2 wins7 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| AIME26Source | 99.2% | — | Not comparable |
| HMMT Nov 2025Source | 94.4% | — | Not comparable |
| HMMT Feb 2026Source | 92.5% | — | Not comparable |
| MMAnswerBenchSource | 91.0% | — | Not comparable |
| FrontierMath (legacy)Source | — | 52.4% | Not comparable |
| FrontierMath v2 (Tiers 1-3)Source | — | 51.000% | Not comparable |
| FrontierMath v2 (Tier 4)Source | — | 39.600% | Not comparable |
Multimodal1 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1340 | — | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GLM-5.2 | GPT-5.5 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 73.3% | — | Not comparable |
Frequently Asked Questions (4)
Which is better, GLM-5.2 or GPT-5.5 Pro?
GLM-5.2 is ahead on BenchLM's BenchAlign leaderboard, 63.96 to 63.69. The biggest single separator in this matchup is HLE, where the scores are 54.7% and 57.2%.
Which is better for knowledge tasks, GLM-5.2 or GPT-5.5 Pro?
GLM-5.2 has the edge for knowledge tasks in this comparison, averaging 59.6 versus 57.2. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Which is better for math, GLM-5.2 or GPT-5.5 Pro?
GLM-5.2 has the edge for math in this comparison, averaging 95.9 versus 48.1. GPT-5.5 Pro stays close enough that the answer can still flip depending on your workload.
Which is better for agentic tasks, GLM-5.2 or GPT-5.5 Pro?
GPT-5.5 Pro has the edge for agentic tasks in this comparison, averaging 90.1 versus 81. GLM-5.2 stays close enough that the answer can still flip depending on your workload.
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