GPT-5.3 Chat Latest Model Released

OpenAI released gpt-5.3-chat-latest to the Chat Completions and Responses API, pointing to the GPT-5.3 Instant snapshot used in ChatGPT.

Mar 3, 2026

At a glance

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Affected

OpenAI · gpt-5

New Launch

Cost impact

Low · 0/5

Estimated from pricing and window changes

Migration pressure

Low · 1/5

No explicit deadline yet

Next step

Keep monitoring the official rollout

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Impact summary

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Cost

Low

Score 0/50%

Quality

Medium

Score 2/540%

Migration

Low

Score 1/520%

Reliability

Low

Score 0/50%

Compliance

Low

Score 0/50%

New model release may require updates to API calls or testing to ensure compatibility.

Changes

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After

March, 2026
gpt-5.3-chat-latest
Released  gpt-5.3-chat-latest  to the Chat Completions and Responses API. This model points to the GPT-5.3 Instant snapshot currently used in ChatGPT. Read more  here .

Sources

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changelog

OpenAI Changelog

March, 2026

Open

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