Today's price · per 1M tokens
Input
$30.00
per 1M tokens
Output
$180.00
per 1M tokens
Blended
$105.00
avg of input & output $/1M
Cached input
$3.00
10% of input — prompt caching
Source: official OpenAI pricing · read Jul 3, 2026
MODELPRICEWATCH.COM · 2026-08-01
Overview
Highest-capability GPT-5.5 tier for the hardest professional and research workloads. 1.05M context, multimodal input.
Capabilities
struck through = not supportedInput 2/5
Text ✓
Image ✓
Audio
Video
PDF
Output 1/5
Text ✓
Image
Audio
Video
Embedding
Features 4/9
Prompt caching ✓
Reasoning ✓
Coding
Fast inference
Long context ✓
Open weights
Multimodal ✓
Web search
Realtime
Benchmark performance
accuracy % · higher is betterAvg benchmark score43.1%
Perf per $/Mtok0.4
Humanity's Last Exam
43.1%
Independent composite scores
- LMSYS Chatbot Arena: 1510 ELO (Human preference)
How it stacks up
- Ranks #64 of 68 benchmarked models by average score
- Ranks #7 of 133 comparably-measured models by percentile score, across 2 independent measurements
- Ranks #130 of 133 comparably-tested models by normalized performance per dollar
- Strongest at Humanity's Last Exam — 43.1%, #12 of 44
Source: Vellum LLM Leaderboard · updated Aug 1, 2026 · See full rankings →
Specifications
- Provider
- OpenAI
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Apr 23, 2026
- Status
- Current
- Last updated
- Jul 3, 2026
- Tags
Availability verified: Jul 3, 2026 — listed on OpenAI's own page