LLM Leaderboard
GPT-5.5
by OpenAI Reasoning
RunFree Score
78.8
#5 overall
Blended price
$11.25
per 1M tokens
Context
1.1M
tokens
Max output
128K
tokens
Output speed
—
tokens / sec
Latency (TTFT)
—
first token
Uptime
99.8%
last 24h
Providers
3
serving this model
Capability profile
Not enough categorised benchmark data to chart a profile yet.
Compare GPT-5.5
See it side by side with any other model — benchmarks, price and specs.
Benchmark results
| Benchmark | Category | Score | As of | Source |
|---|---|---|---|---|
| Terminal-Bench | agentic | 78.2% | May 28, 2026 | cite |
| Humanity's Last Exam | knowledge | 41.4% | May 28, 2026 | cite |
Every score links to its original source. See our methodology for how the RunFree Score is computed.
API pricing
- Input
- $5.00 / 1M
- Output
- $30.00 / 1M
- Cached input
- $0.50 / 1M
- Blended (3:1)
- $11.25 / 1M
Specifications
- Provider
- OpenAI
- Context window
- 1.1M
- Max output
- 128K
- Reasoning model
- Yes
- Modality
- multimodal
- Released
- Apr 24, 2026