Model comparison
gpt-oss-20b vs Grok Build 0.1
Grok Build 0.1 is the stronger model overall, scoring 36.4 to 32.5 on the Noometry Index. gpt-oss-20b costs 35× less per token, which makes it the better buy when Grok Build 0.1's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Summary
- They share 2 benchmarks with published results for both. gpt-oss-20b scores higher in 0 categories and Grok Build 0.1 in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Grok Build 0.1 leads 22.7 to 9.3.
- The biggest single-benchmark swing is SciCode: 34.4% for gpt-oss-20b and 50.2% for Grok Build 0.1.
- gpt-oss-20b is cheaper at $0.018 / $0.09 per million input/output tokens, against $1 / $2 for Grok Build 0.1.
- Grok Build 0.1 accepts more context: 256K tokens versus 131K.
- gpt-oss-20b has downloadable open weights; the other is API-only.
Side by side
| gpt-oss-20b | Grok Build 0.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 32.5 | 36.4 |
| Released | 2025-08-05 | 2026-04-16 |
| Weights | Open | Proprietary |
| Context window | 131K | 256K |
| Max output | 16K | 256K |
| Input $ / M tokens | $0.018 | $1 |
| Output $ / M tokens | $0.09 | $2 |
| Results tracked | 34 | 3 |
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Category by category
Coding Grok Build 0.1 leads
gpt-oss-20b: 37.6 (#192), Grok Build 0.1: 43.1 (#91)
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| SciCode | 34.4% | 50.2% |
| WeirdML | 40.9% | — |
| LMArena Coding | 1306 | — |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Grok Build 0.1 leads
gpt-oss-20b: 9.3 (#154), Grok Build 0.1: 22.7 (#129)
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| Terminal-Bench | 3.4% | — |
| GBAEval | — | 2.4% |
Reasoning Grok Build 0.1 leads
gpt-oss-20b: 19.3 (#261), Grok Build 0.1: 32.2 (#77)
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| CritPt | 1.4% | 9.1% |
| Kagi LLM Benchmark | 53.2% | — |
| Chess Puzzles | 4% | — |
| LMArena Hard Prompts | 1274 | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math Not comparable
gpt-oss-20b: 39.4 (#103), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
| LMArena Math | 1317 | — |
Knowledge Not comparable
gpt-oss-20b: 34.6 (#195), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
| LMArena Expert | 1258 | — |
Multilingual Not comparable
gpt-oss-20b: 42.2 (#197), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| LMArena Non-English | 1268 | — |
| LMArena Chinese | 1314 | — |
| LMArena German | 1255 | — |
| LMArena Japanese | 1244 | — |
| LMArena Korean | 1236 | — |
| LMArena Russian | 1278 | — |
| LMArena Spanish | 1267 | — |
Instruction Following Not comparable
gpt-oss-20b: 61.8 (#240), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| IFEval | 73.2% | — |
| LMArena Instruction Following | 1236 | — |
Long Context Not comparable
gpt-oss-20b: 37.9 (#209), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| LMArena Longer Query | 1250 | — |
Writing & Preference Not comparable
gpt-oss-20b: 35.5 (#265), Grok Build 0.1: —
| Benchmark | gpt-oss-20b | Grok Build 0.1 |
|---|---|---|
| LMArena Text | 1287 | — |
| LMArena Creative Writing | 1201 | — |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
| LMArena Multi-Turn | 1268 | — |
Frequently asked questions
Is gpt-oss-20b better than Grok Build 0.1?
Grok Build 0.1 is the stronger model overall, scoring 36.4 to 32.5 on the Noometry Index. gpt-oss-20b costs 35× less per token, which makes it the better buy when Grok Build 0.1's lead doesn't matter for your workload.
Which is cheaper, gpt-oss-20b or Grok Build 0.1?
gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Grok Build 0.1 lists at $1 and $2.
Is gpt-oss-20b or Grok Build 0.1 better for coding?
Grok Build 0.1 scores higher on coding benchmarks: 43.1 versus 37.6 in the Noometry coding category.
Which has the bigger context window?
Grok Build 0.1 does, with 256K tokens against 131K.
How many benchmarks do gpt-oss-20b and Grok Build 0.1 share?
2 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Grok Build 0.1 has 3.