Model comparison
GPT-5 Nano vs Granite 3.1 2b Instruct
GPT-5 Nano and Granite 3.1 2b Instruct score almost the same on the Noometry Index (33.5 vs 33.2), so choose on price, context window or the category you care about most.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. GPT-5 Nano scores higher in 5 categories and Granite 3.1 2b Instruct in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in instruction following, where GPT-5 Nano leads 75.0 to 57.7.
- Granite 3.1 2b Instruct has downloadable open weights; the other is API-only.
Side by side
| GPT-5 Nano | Granite 3.1 2b Instruct | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 33.5 | 33.2 |
| Released | 2025-08-07 | — |
| Weights | Proprietary | Open |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.05 | — |
| Output $ / M tokens | $0.40 | — |
| Results tracked | 49 | 12 |
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Category by category
Coding Too close to call
GPT-5 Nano: 33.6 (#254), Granite 3.1 2b Instruct: 33.4 (#257)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Coding | 1351 | 1149 |
| SWE-bench Verified (bash only) | 34.8% | — |
| WeirdML | 38.1% | — |
| ALE-Bench | 718.67 | — |
Agentic & Tool Use Not comparable
GPT-5 Nano: 25.8 (#106), Granite 3.1 2b Instruct: —
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| Terminal-Bench | 21.8% | — |
| Berkeley Function Calling Leaderboard | 51.5% | — |
Reasoning Granite 3.1 2b Instruct leads
GPT-5 Nano: 16.3 (#306), Granite 3.1 2b Instruct: 22.0 (#209)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1328 | 1138 |
| ARC-AGI-2 | 2.6% | — |
| Kagi LLM Benchmark | 62.2% | — |
| ARC-AGI-1 | 20.7% | — |
| Chess Puzzles | 27% | — |
| Mystery Game Puzzles | 9% | — |
| DTBench | 62.7% | — |
| LMCA | 7.9% | — |
| Epoch Capabilities Index | 139.38 | — |
| ForecastBench | 59.1 | — |
Math Granite 3.1 2b Instruct leads
GPT-5 Nano: 29.4 (#241), Granite 3.1 2b Instruct: 33.1 (#206)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Math | 1317 | 1159 |
| FrontierMath (Tiers 1-3) | 20% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 81.1% | — |
| ProofBench | 12% | — |
| Omni-MATH | 54.6% | — |
| MATH Level 5 | 95.2% | — |
| FrontierMath (Feb 2025 set) | 8.3% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge GPT-5 Nano leads
GPT-5 Nano: 35.9 (#178), Granite 3.1 2b Instruct: 30.8 (#224)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Expert | 1321 | 1131 |
| GPQA Diamond | 69.4% | — |
| SimpleQA Verified | 11.7% | — |
| MMLU-Pro | 77.8% | — |
| Vectara Hallucination Rate | 10.5% | — |
| GPQA (HELM) | 67.9% | — |
Multimodal Not comparable
GPT-5 Nano: 31.3 (#108), Granite 3.1 2b Instruct: —
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Vision | 1159 | — |
| VPCT | 37.2% | — |
Multilingual GPT-5 Nano leads
GPT-5 Nano: 45.3 (#172), Granite 3.1 2b Instruct: 29.1 (#269)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Non-English | 1313 | 1068 |
| LMArena Chinese | 1356 | 1139 |
| LMArena Russian | 1296 | 1063 |
| LMArena German | 1327 | — |
| LMArena Japanese | 1226 | — |
| LMArena Korean | 1269 | — |
| LMArena Spanish | 1360 | — |
Instruction Following GPT-5 Nano leads
GPT-5 Nano: 75.0 (#79), Granite 3.1 2b Instruct: 57.7 (#264)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Instruction Following | 1306 | 1116 |
| IFEval | 93.2% | — |
Long Context Granite 3.1 2b Instruct leads
GPT-5 Nano: 31.3 (#281), Granite 3.1 2b Instruct: 35.0 (#244)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Longer Query | 1312 | 1155 |
| Fiction.LiveBench | 44.4% | — |
Writing & Preference GPT-5 Nano leads
GPT-5 Nano: 39.1 (#249), Granite 3.1 2b Instruct: 34.1 (#274)
| Benchmark | GPT-5 Nano | Granite 3.1 2b Instruct |
|---|---|---|
| LMArena Text | 1320 | 1127 |
| LMArena Creative Writing | 1249 | 1116 |
| LMArena Multi-Turn | 1311 | 1099 |
| EQ-Bench Creative Writing | 705 | — |
| WildBench | 80.6% | — |
Frequently asked questions
Is GPT-5 Nano better than Granite 3.1 2b Instruct?
GPT-5 Nano and Granite 3.1 2b Instruct score almost the same on the Noometry Index (33.5 vs 33.2), so choose on price, context window or the category you care about most.
Is GPT-5 Nano or Granite 3.1 2b Instruct better for coding?
They score almost the same on coding (33.6 vs 33.4); test both on your own repository before choosing.
How many benchmarks do GPT-5 Nano and Granite 3.1 2b Instruct share?
12 benchmarks have published results for both models. GPT-5 Nano has 49 scored results on Noometry and Granite 3.1 2b Instruct has 12.