Model comparison
Gemini 2.5 Flash vs GLM-5.1
GLM-5.1 is the stronger model overall, scoring 47.8 to 39.3 on the Noometry Index. Gemini 2.5 Flash costs 2.5× less per token, which makes it the better buy when GLM-5.1's lead doesn't matter for your workload.
Last verified . 27 shared benchmarks.
GoogleSummary
- They share 27 benchmarks with published results for both. Gemini 2.5 Flash scores higher in 2 categories and GLM-5.1 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GLM-5.1 leads 39.1 to 18.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 73.1% for Gemini 2.5 Flash and 93.3% for GLM-5.1.
- Gemini 2.5 Flash is cheaper at $0.30 / $2.50 per million input/output tokens, against $1.40 / $4.40 for GLM-5.1.
- Gemini 2.5 Flash accepts more context: 1.05M tokens versus 200K.
- GLM-5.1 has downloadable open weights; the other is API-only.
Side by side
| Gemini 2.5 Flash | GLM-5.1 | |
|---|---|---|
| Provider | Z.ai (Zhipu) | |
| Noometry Index | 39.3 | 47.8 |
| Released | 2025-04-17 | 2026-04-07 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 200K |
| Max output | 66K | 131K |
| Input $ / M tokens | $0.30 | $1.40 |
| Output $ / M tokens | $2.50 | $4.40 |
| Results tracked | 54 | 41 |
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Category by category
Coding GLM-5.1 leads
Gemini 2.5 Flash: 35.8 (#220), GLM-5.1: 48.7 (#55)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| WeirdML | 41.9% | 57.1% |
| LMArena Coding | 1424 | 1485 |
| ALE-Bench | 661.88 | 887.1 |
| SWE-bench Verified | — | 74.2% |
| SWE-bench Verified (bash only) | 28.7% | — |
| Aider Polyglot | 55.1% | — |
| LMArena WebDev | — | 1508 |
| SciCode | — | 43.8% |
Agentic & Tool Use Gemini 2.5 Flash leads
Gemini 2.5 Flash: 30.8 (#74), GLM-5.1: 24.9 (#113)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| Vending-Bench 2 | 548.84 | 5,634 |
| Terminal-Bench | 17.1% | — |
| APEX-Agents | — | 40.9% |
| Berkeley Function Calling Leaderboard | 56.2% | — |
| TheAgentCompany | 41.1% | — |
| BALROG | 33.5% | — |
| ExploitBench | — | 18.1% |
| GBAEval | — | 0% |
Reasoning GLM-5.1 leads
Gemini 2.5 Flash: 18.1 (#286), GLM-5.1: 39.1 (#60)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| SimpleBench | 41.2% | 55.1% |
| CritPt | 1.1% | 4.6% |
| LMArena Hard Prompts | 1422 | 1472 |
| Epoch Capabilities Index | 143.03 | 149.84 |
| ARC-AGI-2 | 2.5% | — |
| Kagi LLM Benchmark | 56.8% | — |
| NYT Connections (extended) | — | 77.7% |
| ARC-AGI-1 | 33.3% | — |
| Chess Puzzles | — | 19% |
| EnigmaEval | 2.7% | — |
| Thematic Generalization | — | 69.8% |
| DTBench | 76.5% | — |
| LMCA | 27.5% | — |
| ForecastBench | 60.6 | — |
Math GLM-5.1 leads
Gemini 2.5 Flash: 39.9 (#98), GLM-5.1: 49.7 (#60)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.1% | 93.3% |
| LMArena Math | 1415 | 1473 |
| FrontierMath (Feb 2025 set) | 4.8% | 33.4% |
| FrontierMath Tier 4 (v1) | 4.2% | 12.5% |
| FrontierMath (Tiers 1-3) | — | 36.8% |
| MathArena Final-Answer Competitions | — | 67.1% |
| ProofBench | — | 22.2% |
| Omni-MATH | 38.5% | — |
Knowledge GLM-5.1 leads
Gemini 2.5 Flash: 36.4 (#168), GLM-5.1: 54.9 (#50)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Expert | 1426 | 1476 |
| GPQA Diamond | — | 89.9% |
| Humanity's Last Exam | 12.1% | — |
| SimpleQA Verified | — | 34% |
| MMLU-Pro | 63.9% | — |
| Confabulations | 16.8% | — |
| Vectara Hallucination Rate | 7.8% | — |
| GPQA (HELM) | 39% | — |
Multimodal Not comparable
Gemini 2.5 Flash: 41.8 (#32), GLM-5.1: —
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Vision | 1253 | — |
| GeoBench | 76% | — |
| VPCT | 46.2% | — |
| SpatialViz-Bench | 36.9% | — |
Multilingual GLM-5.1 leads
Gemini 2.5 Flash: 52.3 (#88), GLM-5.1: 55.0 (#36)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Non-English | 1409 | 1447 |
| LMArena Chinese | 1450 | 1515 |
| LMArena French | 1433 | 1474 |
| LMArena German | 1418 | 1465 |
| LMArena Japanese | 1405 | 1434 |
| LMArena Korean | 1385 | 1418 |
| LMArena Russian | 1415 | 1454 |
| LMArena Spanish | 1421 | 1469 |
Instruction Following Too close to call
Gemini 2.5 Flash: 75.7 (#54), GLM-5.1: 76.3 (#42)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Instruction Following | 1405 | 1451 |
| IFEval | 89.8% | — |
Long Context Gemini 2.5 Flash leads
Gemini 2.5 Flash: 47.5 (#17), GLM-5.1: 44.9 (#53)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Longer Query | 1419 | 1466 |
| Fiction.LiveBench | 77.8% | — |
Writing & Preference GLM-5.1 leads
Gemini 2.5 Flash: 53.8 (#157), GLM-5.1: 66.9 (#31)
| Benchmark | Gemini 2.5 Flash | GLM-5.1 |
|---|---|---|
| LMArena Text | 1417 | 1461 |
| LMArena Creative Writing | 1400 | 1453 |
| EQ-Bench Creative Writing | 1137 | 1592 |
| LMArena Multi-Turn | 1408 | 1472 |
| Short-Story Creative Writing | 76.5% | — |
| WildBench | 81.7% | — |
Frequently asked questions
Is Gemini 2.5 Flash better than GLM-5.1?
GLM-5.1 is the stronger model overall, scoring 47.8 to 39.3 on the Noometry Index. Gemini 2.5 Flash costs 2.5× less per token, which makes it the better buy when GLM-5.1's lead doesn't matter for your workload.
Which is cheaper, Gemini 2.5 Flash or GLM-5.1?
Gemini 2.5 Flash is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; GLM-5.1 lists at $1.40 and $4.40.
Is Gemini 2.5 Flash or GLM-5.1 better for coding?
GLM-5.1 scores higher on coding benchmarks: 48.7 versus 35.8 in the Noometry coding category.
Which has the bigger context window?
Gemini 2.5 Flash does, with 1.05M tokens against 200K.
How many benchmarks do Gemini 2.5 Flash and GLM-5.1 share?
27 benchmarks have published results for both models. Gemini 2.5 Flash has 54 scored results on Noometry and GLM-5.1 has 41.