Leaderboard / OpenAI
gpt-oss-20b
OpenAI OPEN Apache 2.0
Verdict
gpt-oss-20b is behind the leaders: #247 of 406 by SIscope score. Strongest at math, weaker at following instructions. Cheaper than 98% of priced models. Weights are open, so you can run it yourself.
SIscope score
36
#247 of 406
Human-vote rank
#263
of 419 · score 1287
Price per 1M tokens, blended
$0.055
$0.03 in · $0.13 out
Context window
131K
131,072 tokens
Shape
Each spoke is a category, 0 at the centre, 100 at the edge.
Category scores
Percentiles: 90 means better than about 90% of tested models.
Human-vote score over time
Text arena, recent updates.
Independent test runs
Run by Epoch AI on the same harness for every model. Bars show the share of questions answered correctly.
No Epoch AI runs for this model yet.
Human-vote arenas
People compare two anonymous answers and pick the better one. Scores work like chess ratings.
| Arena | Rank | Score | Range (95%) | Votes | Updated |
|---|---|---|---|---|---|
| Text arena Everyday chat, blind human votes | #263 of 419 | 1287 | 1281–1294 | 10,416 | Oct 28, 2026 |
| WebDev arena Building web apps, blind human votes | Not on this board yet | ||||
| Vision arena Questions about images, blind human votes | Not on this board yet | ||||
| Agent arena Real multi-step agent sessions | Not on this board yet | ||||
Source: Arena (formerly LMArena) leaderboard dataset, CC BY 4.0. Fetched Nov 4, 2026.
Price
Input
$0.03
per 1M tokens
Output
$0.13
per 1M tokens
Blended
$0.055
3 in : 1 out, per 1M
Context window
131K
max tokens per request
Speed
Coming soon
our own tests
List price from the OpenRouter models API (openai/gpt-oss-20b), Nov 4, 2026. Providers can charge differently.