Which is cheaper, Gpt 5.1 Codex or Gpt 5.1 Instant?
Gpt 5.1 Codex costs $1.25/M input; Gpt 5.1 Instant costs $1.25/M input. Price spread matters at billion-token scale.
Gateway catalog snapshot.
Gpt 5.1 Codex is cheaper at $1.25/M input vs $1.25/M input for Gpt 5.1 Instant. Compare context, hosts, and o10 routing bands.
Last updated: 2026-06-27. Full catalog. Reference prices are dated snapshots. Compare total cost and measured task quality before choosing a route.
Gpt 5.1 Codex vs Gpt 5.1 Instant. Price, context, routing
On this page
AnswersSelf-contained
How do Gpt 5.1 Codex and Gpt 5.1 Instant context windows compare?
Gpt 5.1 Codex: 400,000 tokens. Gpt 5.1 Instant: 128,000 tokens.
01Deep dive
Comparison summary
Gpt 5.1 Codex is cheaper at $1.25/M input vs $1.25/M input for Gpt 5.1 Instant. Compare context, hosts, and o10 routing bands.
Gpt 5.1 Codex is cheaper at $1.25/M input vs $1.25/M input for Gpt 5.1 Instant. Compare context, hosts, and o10 routing bands.
SourceMethodology
o10 gateway + fulfillment catalog snapshot.
FAQFrequently asked questions
Common questions
Which is cheaper, Gpt 5.1 Codex or Gpt 5.1 Instant?
Gpt 5.1 Codex at $1.25/M input vs $1.25/M for Gpt 5.1 Instant.
Can you run both on the same hosts?
Gpt 5.1 Codex: OpenAI. Gpt 5.1 Instant: OpenAI.