gpt-oss-120b vs Grok Code Fast 1
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
OpenAI · Aug 2025
OpenAI's open-weights MoE reasoning model under Apache 2.0 — near o4-mini quality, runnable on a single 80GB GPU.
xAI · Aug 2025
A speed-first coding model built for agentic IDE loops, popular as a cheap fast tier in Cursor and similar tools.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. gpt-oss-120b is about 2.6x cheaper per blended million tokens (3:1 input:output mix). Grok Code Fast 1 also takes 256K of context versus 131K for gpt-oss-120b. And gpt-oss-120b is open-weights (Apache 2.0), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Specs & pricing
| gpt-oss-120b | Grok Code Fast 1 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.1 | $0.2 |
| Output price / 1M | $0.5 | $1.5 |
| Context window | 131K | 256K |
| Max output | 131K | — |
| Open weights | yes (Apache 2.0) | no |
| Reasoning model | yes | yes |
| Multimodal input | text | text |
| Knowledge cutoff | Jun 2024 | Aug 2025 |
| Released | Aug 2025 | Aug 2025 |
| Example monthly cost* | $1.75 | $4.25 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, gpt-oss-120b or Grok Code Fast 1?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. gpt-oss-120b is about 2.6x cheaper per blended million tokens (3:1 input:output mix). Grok Code Fast 1 also takes 256K of context versus 131K for gpt-oss-120b. And gpt-oss-120b is open-weights (Apache 2.0), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, gpt-oss-120b or Grok Code Fast 1?
- gpt-oss-120b costs $0.1/$0.5 per million input/output tokens, while Grok Code Fast 1 costs $0.2/$1.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $1.75 versus $4.25.
- Which model is better for coding, gpt-oss-120b or Grok Code Fast 1?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.