Model comparison
GPT-5.5 Pro vs Granite 4.2 8B
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 40.5 on the Noometry Index. Granite 4.2 8B costs 628× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 26.6.
- Granite 4.2 8B is cheaper at $0.06 / $0.25 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 131K.
- Granite 4.2 8B has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Granite 4.2 8B | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 64.3 | 40.5 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | 131K |
| Max output | 128K | 118K |
| Input $ / M tokens | $30 | $0.06 |
| Output $ / M tokens | $180 | $0.25 |
| Results tracked | 14 | 11 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Granite 4.2 8B: 40.5 (#137)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| LMArena Coding | — | 1380 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Granite 4.2 8B: 26.6 (#131)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1329 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math Not comparable
GPT-5.5 Pro: 84.0 (#10), Granite 4.2 8B: —
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| 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: 64.1 (#19), Granite 4.2 8B: 38.4 (#145)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1384 |
Multilingual Not comparable
GPT-5.5 Pro: —, Granite 4.2 8B: 44.5 (#178)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| LMArena Non-English | — | 1302 |
| LMArena Chinese | — | 1366 |
| LMArena Russian | — | 1285 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Granite 4.2 8B: 68.7 (#184)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| LMArena Instruction Following | — | 1301 |
Long Context Not comparable
GPT-5.5 Pro: —, Granite 4.2 8B: 40.3 (#159)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| LMArena Longer Query | — | 1324 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Granite 4.2 8B: 49.6 (#189)
| Benchmark | GPT-5.5 Pro | Granite 4.2 8B |
|---|---|---|
| LMArena Text | — | 1320 |
| LMArena Creative Writing | — | 1236 |
| LMArena Multi-Turn | — | 1301 |
Frequently asked questions
Is GPT-5.5 Pro better than Granite 4.2 8B?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 40.5 on the Noometry Index. Granite 4.2 8B costs 628× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Granite 4.2 8B?
Granite 4.2 8B is cheaper. It lists at $0.06 per million input tokens and $0.25 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 131K.
How many benchmarks do GPT-5.5 Pro and Granite 4.2 8B share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Granite 4.2 8B has 11.