GPT 5 Mini vs GPT-OSS 20B
openai/gpt-5-mini · openai/gpt-oss-20b
As of October 31, 2026, GPT-OSS 20B is the cheaper API on UberLLM: $0.0000 per million input tokens and $0.0001 per million output, versus $0.0640 / $0.5120 for GPT 5 Mini, about 100% less when output is 3 tokens for every input token. These are the median prices buyers paid over the last 24 hours. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GPT-OSS 20B to cut cost; choose GPT 5 Mini when context size wins. GPT 5 Mini carries the larger context window (400,000 vs 128,000 tokens), which can matter for long-document work.
GPT 5 Mini vs GPT-OSS 20B, side by side
| Spec | GPT 5 Mini | GPT-OSS 20B |
|---|---|---|
| Price · input / 1M | $0.0640 | $0.0000 |
| Price · output / 1M | $0.5120 | $0.0001 |
| Context length | 400,000 | 128,000 |
| Max output tokens | 128,000 | 16,000 |
| Input modalities | text, image | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | — |
| % off list | 74% off | 99.9% off |
Median prices buyers paid on UberLLM over the last 24 hours. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated October 31, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
GPT 5 Mini vs GPT-OSS 20B — FAQ
Is GPT 5 Mini or GPT-OSS 20B cheaper?
GPT-OSS 20B is cheaper on a blended token mix, by about 100%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between GPT 5 Mini and GPT-OSS 20B?
GPT 5 Mini: $0.0640 in / $0.5120 out per 1M tokens. GPT-OSS 20B: $0.0000 in / $0.0001 out per 1M tokens. That's roughly a 100% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT 5 Mini and GPT-OSS 20B with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.