Model comparison
GPT-5-Codex vs Granite 4.2 8B
Granite 4.2 8B is the stronger model overall, scoring 40.5 to 37.9 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5-Codex leads 30.9 to 26.6.
- Granite 4.2 8B is cheaper at $0.06 / $0.25 per million input/output tokens, against $1.25 / $10 for GPT-5-Codex.
- GPT-5-Codex accepts more context: 400K tokens versus 131K.
- Granite 4.2 8B has downloadable open weights; the other is API-only.
Side by side
| GPT-5-Codex | Granite 4.2 8B | |
|---|---|---|
| Provider | OpenAI | IBM |
| Noometry Index | 37.9 | 40.5 |
| Released | 2025-09-15 | — |
| Weights | Proprietary | Open |
| Context window | 400K | 131K |
| Max output | 128K | 118K |
| Input $ / M tokens | $1.25 | $0.06 |
| Output $ / M tokens | $10 | $0.25 |
| Results tracked | 3 | 11 |
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Category by category
Coding GPT-5-Codex leads
GPT-5-Codex: 42.4 (#103), Granite 4.2 8B: 40.5 (#137)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1380 |
Agentic & Tool Use Not comparable
GPT-5-Codex: 31.0 (#72), Granite 4.2 8B: —
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| Terminal-Bench | 44.3% | — |
Reasoning GPT-5-Codex leads
GPT-5-Codex: 30.9 (#83), Granite 4.2 8B: 26.6 (#131)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1329 |
Knowledge Not comparable
GPT-5-Codex: —, Granite 4.2 8B: 38.4 (#145)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| LMArena Expert | — | 1384 |
Multilingual Not comparable
GPT-5-Codex: —, Granite 4.2 8B: 44.5 (#178)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| LMArena Non-English | — | 1302 |
| LMArena Chinese | — | 1366 |
| LMArena Russian | — | 1285 |
Instruction Following Not comparable
GPT-5-Codex: —, Granite 4.2 8B: 68.7 (#184)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| LMArena Instruction Following | — | 1301 |
Long Context Not comparable
GPT-5-Codex: —, Granite 4.2 8B: 40.3 (#159)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| LMArena Longer Query | — | 1324 |
Writing & Preference Not comparable
GPT-5-Codex: —, Granite 4.2 8B: 49.6 (#189)
| Benchmark | GPT-5-Codex | Granite 4.2 8B |
|---|---|---|
| LMArena Text | — | 1320 |
| LMArena Creative Writing | — | 1236 |
| LMArena Multi-Turn | — | 1301 |
Frequently asked questions
Is GPT-5-Codex better than Granite 4.2 8B?
Granite 4.2 8B is the stronger model overall, scoring 40.5 to 37.9 on the Noometry Index.
Which is cheaper, GPT-5-Codex 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-Codex lists at $1.25 and $10.
Is GPT-5-Codex or Granite 4.2 8B better for coding?
GPT-5-Codex scores higher on coding benchmarks: 42.4 versus 40.5 in the Noometry coding category.
Which has the bigger context window?
GPT-5-Codex does, with 400K tokens against 131K.
How many benchmarks do GPT-5-Codex and Granite 4.2 8B share?
0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Granite 4.2 8B has 11.