OpenAI
GPT-5.5
OpenAI's frontier — 1M-token context, strongest general reasoning.
ReasoningLong contextMultimodal
$ / 1M input
$5.000
What you pay per million prompt tokens.
$ / 1M output
$30.000
What you pay per million completion tokens.
Blended (70 / 30)
$12.500
Typical chat workload mix.
Ratings & benchmarks
Snapshot 2026-04-28Overall
4.9 / 5
Composite of intelligence + reliability.
Output speed
70 t/s
Output tokens per second under typical load.
Time to first token
3.0 s
Lower is better. Reasoning models naturally stretch this.
Value
3.0 / 5
Intelligence per dollar at typical mix.
Context window
1,050,000 tokens