Enable a 1M Context Budget in Codex for GPT-5.6 Sol
A concise Codex config recipe for users who want to try a larger context budget with GPT-5.6 Sol, including the exact TOML keys and a verification caveat.
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This is a practical Codex configuration snippet for users who want to experiment with a larger local context budget when using GPT-5.6 Sol.
The useful part is small: set the model, set the context budget Codex should plan around, and set an automatic compaction threshold below that ceiling so the session keeps headroom for tool output and the next model request.
model = "gpt-5.6-sol"
model_context_window = 1000000
model_auto_compact_token_limit = 900000
Put these keys at the top level of ~/.codex/config.toml, before any [section] headers. Restart the Codex client and start a new session after saving so the new configuration layer is loaded cleanly.
For a one-off CLI session, use config overrides instead of changing defaults:
codex -m gpt-5.6-sol \
-c model_context_window=1000000 \
-c model_auto_compact_token_limit=900000
Best fit: long repository audits, large migrations, multi-file review sessions, and workflows where repeated summarization would lose too much local detail. Avoid it for quick tasks where the larger window only increases cost or latency.
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