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feat: raise Codex OAuth context to 900K for gpt-5.6 family and gpt-5.4 (subscription 1M rollout)

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OpenAI enabled the large-context window for ChatGPT-subscription Codex
accounts (announced by @thsottiaux Aug 16 2026; previously API-key-only).
Live re-probe the same day: 911,276 input tokens completed OK on
gpt-5.6-sol; ~925K+ rejected with context_length_exceeded (1.05M window
minus reserved output headroom). terra, luna, and gpt-5.4 all completed
900,026 tokens OK. The Codex catalog still advertises 272K, so the
stale-advertisement override from #87981 is the right lever — this just
raises its value 350K -> 900K.

gpt-5.5 and gpt-5.4-mini still enforce 272K live (rejected 500K) and
remain excluded. Override semantics unchanged: fires only on an
exactly-272,000 advertisement; any live catalog change is trusted
verbatim.
This commit is contained in:
Teknium
2026-08-16 18:24:43 -07:00
parent 8236b41771
commit bab7be3ca7
2 changed files with 22 additions and 15 deletions
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agent/model_metadata.py
+14 -9
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@@ -2348,12 +2348,17 @@ _CODEX_OAUTH_CONTEXT_FALLBACK: Dict[str, int] = {
}
# Codex OAuth advertises 272K via /backend-api/codex/models for these
# families, but the backend actually ACCEPTS more (verified live Aug 16 2026
# against chatgpt.com/backend-api/codex/responses: ~371K input tokens
# completed OK for gpt-5.6-sol/terra/luna and gpt-5.4; ~382K+ rejected with
# ``context_length_exceeded``; gpt-5.5 rejected 360K, so its 272K
# advertisement is real and it is NOT listed). 350K keeps ~22K margin under
# the observed ~372K enforcement.
# families, but the backend actually ACCEPTS far more. OpenAI enabled the
# large-context window for ChatGPT-subscription Codex accounts on
# Aug 16 2026 (announced by @thsottiaux; previously API-key-only).
# Verified live against chatgpt.com/backend-api/codex/responses the same
# day: 911,276 input tokens completed OK on gpt-5.6-sol; ~925K+ rejected
# with ``context_length_exceeded`` (the 1.05M window minus reserved output
# headroom). gpt-5.6-terra, gpt-5.6-luna, and gpt-5.4 all completed 900,026
# tokens OK. gpt-5.5 and gpt-5.4-mini still rejected >272K, so their
# advertisement is real enforcement and they are NOT listed. 900K keeps
# ≥11K margin under the observed ceiling and matches the compaction point
# Codex's own client config documents for the 1M window.
#
# Applied ONLY when the resolved value (live probe or fallback table) is
# exactly the known-stale 272,000 advertisement — if OpenAI moves the
@@ -2362,13 +2367,13 @@ _CODEX_OAUTH_CONTEXT_FALLBACK: Dict[str, int] = {
# this table is inert. ``gpt-5.6`` is a FAMILY PREFIX (sol/terra/luna and
# dated snapshots; ``-pro`` slugs are not routable on Codex OAuth — the
# backend 400s them — so over-matching there is moot). ``gpt-5.4`` is EXACT:
# gpt-5.4-mini was probed and genuinely enforces 272K (rejected 360K), so
# gpt-5.4-mini was probed and genuinely enforces 272K (rejected 500K), so
# prefix-matching the 5.4 family would over-report for mini.
_CODEX_OAUTH_VERIFIED_ABOVE_ADVERTISED_PREFIXES: Dict[str, int] = {
"gpt-5.6": 350_000, # sol / terra / luna — all three verified live
"gpt-5.6": 900_000, # sol / terra / luna — all three verified live at 900K
}
_CODEX_OAUTH_VERIFIED_ABOVE_ADVERTISED_EXACT: Dict[str, int] = {
"gpt-5.4": 350_000, # verified live; gpt-5.4-mini rejected 360K — excluded
"gpt-5.4": 900_000, # verified live at 900K; gpt-5.4-mini rejected 500K — excluded
}
# The advertised value the verified-above table is allowed to override.