GPT-5.3 Instant
2026-03-03 · Publisher : OpenAI · Domain : Artificial Intelligence
OpenAI updates ChatGPT's most widely used model with GPT-5.3 Instant: fewer unnecessary refusals, better-synthesized web answers and fewer hallucinations.
What changes
- Rarer refusals and fewer moralizing preambles compared with GPT-5.2 Instant.
- Web search results that are better contextualized and more useful.
- More direct style, better writing quality.
- Available to all ChatGPT users from launch, and in the API as gpt-5.3-chat-latest.
### Specifications - Context: 128,000 tokens, maximum output 16,384 tokens, text and image input, text output. - Knowledge cutoff: August 31, 2025. - GPT-5.2 Instant remains available to paying subscribers for three months, then is retired on June 3, 2026. - API identifier: gpt-5.3-chat-latest (alias pointing to the snapshot used in ChatGPT). ### Pricing | Input | Cached input | Output | | --- | --- | --- | | $1.75 | $0.175 | $14.00 | Price per million tokens (USD). ### Benchmarks | Internal factuality measure | Hallucination reduction | | --- | --- | | High-stakes domains (medicine, law, finance), with web | -26.8% | | High-stakes domains, without web | -19.7% | | User-flagged conversations, with web | -22.5% | | User-flagged conversations, without web | -9.6% | Scores published by the vendor. Internal evaluations, not a public benchmark. ### Key takeaways A behavior update rather than a raw capability one. It changes the tone and perceived reliability of ChatGPT's default model.
Links
Tags : LLM, OpenAI, GPT-5, Instant, ChatGPT