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GPT-5.5 Instant

OpenAI · gpt-5-5-instant

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Compact GPT model for low-latency assistance and high-volume workloads

Specification

most-agreed values

Context
400K
Max output
128K
Released
2026-05-05
Knowledge cutoff
2025-12-01
Retires
Open weights
no
Input
text, image, pdf
Output
text

Price

US dollars per million tokens · most-agreed

Input
$5.00
Output
$30.00
Cache read
$0.50

Quality

5 benchmarks · 1 source

Composite
48th
percentile of 334 scored models
Rank
173 / 334
±0.08 sd
Evidence
5 × 1
one source, or fewer than 3 benchmarks
Effort range
one configuration only
reasoning73rd2/4 bench
math36th3/7 bench

Every score

one row per source and configuration — nothing averaged away

BenchmarkScoreConfigurationSourceRun
GPQA diamond82.5 ±2.3defaultEpoch AI2026-08-02
OTIS Mock AIME 2024-202568.1 ±6.2defaultEpoch AI2026-08-02
Chess Puzzles12.0 ±3.3defaultEpoch AI2026-08-02
FrontierMath-Tiers-1-3-v226.3 ±2.6defaultEpoch AI2026-08-02
FrontierMath-Tier-4-v22.4 ±2.4defaultEpoch AI2026-08-02

The leading figure for a benchmark is the median across its configurations, so one heroic high-effort run cannot set the number.

Available from 1 host

HostIn $/MOut $/MCache rdCache wrContextOutputRetires
zenmux$5.00$30.00$0.50400K128K

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