What variant of Codex are you using?
Codex CLI with the built-in Amazon Bedrock provider.
What feature would you like to see?
AWS now advertises a 1 million token context window for OpenAI GPT-5.6 Sol, Terra, and Luna on Amazon Bedrock. Codex currently limits every GPT-5 model in its static Bedrock catalog to 272,000 tokens.
Please update both context_window and max_context_window to 1_000_000 for:
openai.gpt-5.6-solopenai.gpt-5.6-terraopenai.gpt-5.6-luna
GPT-5.4 and GPT-5.5 should retain their existing 272,000-token limits. context_window controls the active default, while max_context_window caps user configuration overrides, so both fields should reflect the Bedrock limit.
Additional information
AWS announcement: https://aws.amazon.com/about-aws/whats-new/2026/08/gpt-sol-terra-luna-long-context-bedrock/
A tested implementation is available here:
Validation completed with just fmt and just test -p codex-model-provider (59 tests passed).
What variant of Codex are you using?
Codex CLI with the built-in Amazon Bedrock provider.
What feature would you like to see?
AWS now advertises a 1 million token context window for OpenAI GPT-5.6 Sol, Terra, and Luna on Amazon Bedrock. Codex currently limits every GPT-5 model in its static Bedrock catalog to 272,000 tokens.
Please update both
context_windowandmax_context_windowto1_000_000for:openai.gpt-5.6-solopenai.gpt-5.6-terraopenai.gpt-5.6-lunaGPT-5.4 and GPT-5.5 should retain their existing 272,000-token limits.
context_windowcontrols the active default, whilemax_context_windowcaps user configuration overrides, so both fields should reflect the Bedrock limit.Additional information
AWS announcement: https://aws.amazon.com/about-aws/whats-new/2026/08/gpt-sol-terra-luna-long-context-bedrock/
A tested implementation is available here:
Validation completed with
just fmtandjust test -p codex-model-provider(59 tests passed).