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GPT-5.3 Instant (2026-03-03)

OpenAI · 2026-03-03

This is the original GPT-5.3 Instant version publicly launched on March 3, 2026, improving conversational directness and web-grounded answers. Its launch system card identifies the evaluated model as the version shipped on February 26; OpenAI exposed it through gpt-5.3-chat-latest without a separately pinned machine identifier, before the distinct March 16 update.

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