OpenAI, released May 5, 2026

GPT-5.5 Instantprice, context, benchmarks and release details

Provisional: not enough results to rank yet 64% confidence, 2 of 7 expected sources in

58.3

SI Score

#69 of 142 ranked models

Input, per 1M tokens: not yet reported
Output, per 1M tokens: not yet reported
Context window: 400K
Max output: 128K
Released: May 5, 2026

How the score breaks down

Coding —

Math 25.1

Preference 74.9

Reasoning 82.5

Weights: reasoning 30%, math 15%, coding 40%, preference 15%. Results use fixed 0–100 scales before averaging, and thin evidence is pulled toward 50. Method si-v3-retained-evidence-2, computed Oct 9, 2026, 05:13 UTC.

Around it on the leaderboard

67 Qwen3.7 Max 58.6
68 Gemini 3 Pro Preview 58.6
69 GPT-5.5 Instant 58.3
70 MiniMax-M2.7 57.9
71 Fugu Ultra 57.9

Full leaderboard

Benchmark results

5 benchmarks, 5 results

Each row shows the best published result. Where a model was tested at several settings, such as reasoning effort, open the row to see each one. Hover or tap a value for its source.

GPQA Diamondreasoning 82.5% 82.5

FrontierMath Tier 4 (v2)math 2.4% 2.4

FrontierMath Tiers 1–3 (v2)math 26.3% 26.3

OTIS Mock AIME 2024–2025math 68.1% 68.1

LMArena Textpreference 1419.0 elo 74.9

Normalization uses a fixed 0–100 scale for each unit, independent of other models. Compare evaluation conditions before reading a small gap as decisive. “Lab-reported” marks the provider's own published figure.

Details and sources

Open weights: No
License: not yet reported
Input modalities: text, image, pdf
First seen by SuperIndex: Oct 8, 2026
Coverage: 51% of expected source weight

Reported (2)

Epoch AI BenchmarkingOct 8, 2026
LMArena / ArenaOct 8, 2026

Awaiting (5)

ARC Prize13% of weight
Humanity’s Last Exam13% of weight
Official model cards via models.dev4% of weight
LiveBench13% of weight
Terminal-Bench6% of weight

Confidence rises as pending sources publish. Some sources never cover some models, so confidence reaches 100% at 80% of expected weight.