GPT-OSS 120B Alternatives
What is the best alternative to GPT-OSS 120B?
The closest alternative to GPT-OSS 120B (Groq, $0.26/M blended) is GPT-OSS 20B, from Groq, a drop-in migration priced -50% relative to GPT-OSS 120B at blended (3:1) rates. There is no meaningful parity loss on this swap.
The closest match to GPT-OSS 120B (Groq, $0.26/M) is GPT-OSS 20B — a drop-in migration at -50% price.
Ranked — top 8 alternatives
| # | Model | Provider | Effort | $/M (Δ%) | tok/s (Δ%) | Context | Parity | Closeness |
|---|---|---|---|---|---|---|---|---|
| 1 | GPT-OSS 20B | Groq | drop-in | $0.13 (-50%) | +43.6% | 0K | 100% | 94 |
| 2 | Qwen 3.8 30B | Groq | drop-in | $1.20 (+357.1%) | -11.5% | 0K | 100% | 91 |
| 3 | GPT-OSS 120B (Cerebras) | Cerebras | config | $0.45 (+71.4%) | +214.1% | 0K | 83% | 88 |
| 4 | GLM 4.7 (Cerebras) | Cerebras | config | $2.38 (+804.8%) | +153.8% | +69K | 83% | 83 |
| 5 | GLM-5.2 | Z.ai | config | $2.15 (+719%) | — | +869K | 67% | 77 |
| 6 | GPT-5.6 Terra | OpenAI | config | $4.50 (+1614.3%) | -90% | +269K | 83% | 73 |
| 7 | GPT-5.6 Luna | OpenAI | config | $0.45 (+71.4%) | -83.8% | +269K | 67% | 72 |
| 8 | Gemini 3.6 Flash | code-change | $3.38 (+1185.7%) | -85.4% | +869K | 100% | 71 |
Top 3, in detail
Same provider — change the model string, nothing else.
base_url: https://api.groq.com/openai/v1 auth: Bearer API key
base_url: https://api.groq.com/openai/v1 auth: Bearer API key sdk: openai model: "gpt-oss-20b"
Same provider — change the model string, nothing else.
base_url: https://api.groq.com/openai/v1 auth: Bearer API key
base_url: https://api.groq.com/openai/v1 auth: Bearer API key sdk: openai model: "qwen3.8-30b"
Keep the `openai` SDK; change `baseURL` and the API key.
You lose: Loses the 50% batch discount.
base_url: https://api.groq.com/openai/v1 auth: Bearer API key
base_url: https://api.cerebras.ai/v1 auth: Bearer API key sdk: openai model: "cerebras-gpt-oss-120b"
Or don't migrate at all
One base URL, one key, change the model string — every alternative above is already callable through All AI Ask.
curl https://allaiask.com/api/v1/chat \
-H "Authorization: Bearer $ALLAIASK_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "gpt-oss-20b", "messages": [{"role": "user", "content": "Hello"}]}'Related
FAQ
What is the closest alternative to GPT-OSS 120B?
GPT-OSS 20B is the closest match: drop-in migration, -50% price, no significant parity loss.
Can I switch off GPT-OSS 120B without changing my code?
Within Groq, GPT-OSS 20B is a drop-in swap — same request shape, just change the model string.
What do I lose switching from GPT-OSS 120B?
Against the closest match, GPT-OSS 20B, we found no significant parity gap on the dimensions we track.
Prices and specs verified 2026-08-08.