Model comparison
GPT-5.5 Pro vs Granite 4.2 30b
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.4 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 26.7.
- Granite 4.2 30b has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Granite 4.2 30b | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 64.3 | 41.4 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 11 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Granite 4.2 30b: 40.4 (#127)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| LMArena Coding | — | 1394 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.6 (#7), Granite 4.2 30b: 26.7 (#114)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1375 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.45 | — |
Math Not comparable
GPT-5.5 Pro: 83.8 (#8), Granite 4.2 30b: —
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.2 (#17), Granite 4.2 30b: 38.5 (#134)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1405 |
Multilingual Not comparable
GPT-5.5 Pro: —, Granite 4.2 30b: 47.4 (#146)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| LMArena Non-English | — | 1340 |
| LMArena Chinese | — | 1415 |
| LMArena Russian | — | 1342 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Granite 4.2 30b: 71.3 (#150)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| LMArena Instruction Following | — | 1346 |
Long Context Not comparable
GPT-5.5 Pro: —, Granite 4.2 30b: 41.4 (#135)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| LMArena Longer Query | — | 1359 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Granite 4.2 30b: 54.3 (#147)
| Benchmark | GPT-5.5 Pro | Granite 4.2 30b |
|---|---|---|
| LMArena Text | — | 1363 |
| LMArena Creative Writing | — | 1294 |
| LMArena Multi-Turn | — | 1340 |
Frequently asked questions
Is GPT-5.5 Pro better than Granite 4.2 30b?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.4 on the Noometry Index.
How many benchmarks do GPT-5.5 Pro and Granite 4.2 30b share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Granite 4.2 30b has 11.