gpt-oss-120b vs Grok 4.3
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 · Apr 2026
xAI's frontier model: 1M context at $1.25/$2.50, ~168 tokens/sec, and a record low hallucination rate on independent testing.
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. On price the gap is dramatic: gpt-oss-120b works out roughly 7.8x cheaper per blended million tokens. Grok 4.3 also takes 1M 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 4.3 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.1 | $1.25 |
| Output price / 1M | $0.5 | $2.5 |
| Context window | 131K | 1M |
| Max output | 131K | — |
| Open weights | yes (Apache 2.0) | no |
| Reasoning model | yes | yes |
| Multimodal input | text | text, image |
| Knowledge cutoff | Jun 2024 | Mar 2026 |
| Released | Aug 2025 | Apr 2026 |
| Example monthly cost* | $1.75 | $16.25 |
* 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 4.3?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: gpt-oss-120b works out roughly 7.8x cheaper per blended million tokens. Grok 4.3 also takes 1M 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 4.3?
- gpt-oss-120b costs $0.1/$0.5 per million input/output tokens, while Grok 4.3 costs $1.25/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $1.75 versus $16.25.
- Which model is better for coding, gpt-oss-120b or Grok 4.3?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.