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GPT-5.3

OpenAI · GPT-5

Fast everyday GPT-5 tier tuned for general work, coding, and lower-cost production usage.

Part of GPT family · Other versions: GPT-5.3-Codex , GPT-5.4-Pro , GPT-5.4 , GPT-5.2-Codex , GPT-5.2-Pro , GPT-5.2 , GPT-5-Codex , GPT-5 nano , GPT-5 mini , GPT-5 , GPT-4.1 , GPT-4o mini Transcribe , GPT-4o mini TTS , GPT-4o Transcribe , GPT-4o mini , GPT-4o
Type
language
Context
400K tokens
Max Output
128K tokens
Status
current
Input
$0.5/1M tok
Output
$4/1M tok
API Access
Yes
License
proprietary
reasoning everyday-work agentic tool-use coding cost-efficient
Released March 2026 · Updated March 6, 2026

Overview

Freshness note: Model capabilities, limits, and pricing can change quickly. This profile is a point-in-time snapshot last verified on March 6, 2026.

GPT-5.3 is OpenAI’s newer fast workhorse tier in the GPT-5 family. OpenAI positions it as the practical default for everyday use cases where teams want stronger day-to-day quality than earlier GPT-5 baseline routes without paying premium flagship rates.

Capabilities

GPT-5.3 is designed for broad assistant work: drafting, coding, structured outputs, tool use, and general professional workflows. It is a strong fit for high-volume systems that still need solid instruction following and production-friendly reliability.

Technical Details

OpenAI’s model docs list GPT-5.3 with a 400K context window and 128K max output. The March 2026 launch positioning emphasizes fast, useful everyday behavior rather than deep premium reasoning. In practice, this makes it a default candidate for chat, document operations, and product-side automation where speed and cost matter.

Pricing & Access

Published API pricing (per 1M tokens):

  • Input: $0.50
  • Output: $4.00

OpenAI says GPT-5.3 is available through the API and is also rolling out across ChatGPT tiers as the default general model.

Best Use Cases

Use GPT-5.3 for day-to-day assistants, coding support, document workflows, routing layers, and internal tools where quality matters but premium GPT-5.4 pricing is unnecessary.

Comparisons

  • GPT-5.4 (OpenAI): Better choice for harder professional reasoning and longer agent workflows.
  • GPT-5 mini (OpenAI): Mini is cheaper for very high-volume pipelines; GPT-5.3 is the stronger general default.
  • Claude Sonnet 4.6 (Anthropic): Both are broad production models; ecosystem fit and prompt behavior will often decide the winner.