Leaderboard / OpenAI
GPT-5.5 Instant
OpenAI CLOSED Proprietary
83% coverage5 of 6 categoriesMissing: Agents & tools. Missing means no data yet, never a zero.
Verdict
GPT-5.5 Instant is a solid mid-pack model: #134 of 406 by SIscope score. Strongest at following instructions, weaker at math.
SIscope score
61
#134 of 406
Human-vote rank
#121
of 419 · score 1419
Price per 1M tokens, blended
No price yet
Not listed on OpenRouter
Context window
No data yet
Speed: coming soon
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.
What goes into each category · Compare with DeepSeek V4.1 Flash
Text arena over time
Rating (solid) and rank (dashed) at each Arena update we have: 3 of 16 snapshots.
Independent test runs
Run by Epoch AI on the same harness for every model. Bars show the share of questions answered correctly.
GPQA Diamond83%
PhD-level science multiple choice questions
Better than 62% of 333 tested models. Run Aug 2, 2026.
Competition maths problems in the style of AIME
Better than 48% of 313 tested models. Run Aug 2, 2026.
Very hard, unpublished research-style maths problems
Better than 33% of 122 tested models. Run Aug 2, 2026.
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 | #121 of 419 | 1419 | 1414–1424 | 27,128 | Oct 28, 2026 |
| WebDev arena ↗ Building web apps, blind human votes | Not on this board yet | ||||
| Vision arena ↗ Questions about images, blind human votes | #63 of 167 | 1250 | 1241–1258 | 7,590 | Oct 19, 2026 |
| 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
No public list price yet. We only show prices from the OpenRouter models API, and this model isn't listed there under a matching name.