Add GPT-5.3-Codex BYOK model under the OpenAI provider#50122
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rtfeldman
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Feb 27, 2026
Adds `gpt-5.3-codex` as a built-in model under the OpenAI provider for BYOK usage. Model specs: - 400,000 context window - 128,000 max output tokens - Reasoning token support (default medium effort) - Uses the Responses API (like other codex models) - Token counting falls back to the gpt-5 tokenizer Closes AI-59 Release Notes: - Added support for GPT-5.3-Codex as a bring-your-own-key model in the OpenAI provider.
tahayvr
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Mar 4, 2026
…s#50122) Adds `gpt-5.3-codex` as a built-in model under the OpenAI provider for BYOK usage. Model specs: - 400,000 context window - 128,000 max output tokens - Reasoning token support (default medium effort) - Uses the Responses API (like other codex models) - Token counting falls back to the gpt-5 tokenizer Closes AI-59 Release Notes: - Added support for GPT-5.3-Codex as a bring-your-own-key model in the OpenAI provider.
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Adds
gpt-5.3-codexas a built-in model under the OpenAI provider for BYOK usage.Model specs:
Closes AI-59
Release Notes: