Inference
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OpenAI

GPT-5.3 Instant

GPT-5.3 Instant is a reasoning model from OpenAI in the GPT-5.3 family. It has no scored result.

  • Closed weights
  • Reasoning
  • Input: text
  • Released 2026-03
No resultsEnough results for an index.
IndexAll categories, out of 100.UnrankedMedian 51.0
CoverageIndex weight that has results.0%
SpeedOutput tokens per second.—Median 67/s
First tokenSeconds to the first output token.—Median 1.3 s
Input / 1MUS dollars per 1M input tokens.$1.75Median $0.60
Output / 1MUS dollars per 1M output tokens.$14.00Median $2.55
ContextMaximum tokens in one request.400KMedian 262K
EloLMArena rating and rank.—Median 1422

Capabilities

Index per category, out of 100.
Out of 100
AgenticMulti-step tasks with tools.None counted——
CodingCode writing and repair.None counted——
ReasoningLogic problems and puzzles.None counted——
MultimodalTasks with images and text.None counted——
KnowledgeFacts and expert knowledge.None counted——
MultilingualTasks in many languages.None counted——
InstructionTasks with strict prompt rules.None counted——
MathMath problems.None counted——

Results

0 counted
This model has no scored result.

Sources

BenchLMCC BY-NC 4.0

History

5 releases
Output / 1M$14.00 → $14.00
23 Oct 202612 Nov 2026

Questions

How much does GPT-5.3 Instant cost?
$1.75 per 1M input tokens, $14.00 per 1M output tokens.
What is the context window of GPT-5.3 Instant?
400K tokens.
Is GPT-5.3 Instant open source?
No. Its weights are not published.
When was GPT-5.3 Instant released?
March 2026.

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