token.app › Compare › gpt-oss-20b (free) vs Grok 4.5
gpt-oss-20b (free) vs Grok 4.5
gpt-oss-20b (free) is free to use, against $3.00 per million tokens. Grok 4.5 accepts the larger context window (500K).
Head to head
Blended price uses a 3:1 input:output mix
| gpt-oss-20b (free) | Grok 4.5 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | Free | $2.00 |
| Output $/1M | Free | $6.00 |
| Blended $/1M | Free | $3.00 |
| Context window | 131K | 500K |
| Max output | 33K | — |
| Released | Aug 2025 | Jul 2026 |
| Licence | Open weights | Proprietary |
Choose gpt-oss-20b (free) if…
- Costs less per token — Free vs $3.00 blended
- Open weights — self-hostable
Choose Grok 4.5 if…
- Larger context window (500K)
- Newer model (released Jul 2026)
FAQ
Which is better, gpt-oss-20b (free) or Grok 4.5?
We do not hold independently-run benchmark scores covering both gpt-oss-20b (free) and Grok 4.5, so we make no quality claim. Their pricing and specifications are compared on this page.
Is gpt-oss-20b (free) cheaper than Grok 4.5?
gpt-oss-20b (free) is cheaper: Free versus $3.00 per million tokens blended at 3:1 input:output. Input alone: Free vs $2.00. Output alone: Free vs $6.00.
What context windows do gpt-oss-20b (free) and Grok 4.5 have?
gpt-oss-20b (free): 131,072 tokens. Grok 4.5: 500,000 tokens.
Who makes gpt-oss-20b (free) and Grok 4.5?
gpt-oss-20b (free) is made by OpenAI. Grok 4.5 is made by xAI.
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