GPT-5.1-Codex-Max: introducing our newest frontier agentic coding model. GPT-5.1-Codex-Max delivers higher reliability, faster iteration, and support for long-running, project-scale workflows. Learn more at https://www.openai.com/index/gpt-5-1-codex-max
Native Compaction Support: added first-class support for Compaction, improving performance across extended coding sessions.
Expanded Tool Token Limits: codex models now support up to 10,000 tool output tokens. Configure this via tool_output_token_limit in config.toml.
Windows Agent mode: Introduced Agent mode for native Windows. Codex can read files, write files, and run commands in your working folder with fewer approvals. Agent mode uses a new experimental Windows sandbox to limit filesystem and network access. Learn more at https://developers.openai.com/codex/windows
TUI and UX Improvements
- Eliminated ghost snapshot notifications when no git repository is present.
- Codex Resume now displays branches and respects the current working directory for filtering.
- Added placeholder icons for images.
- Credits are now visible in /status.

PRs Merged

fix: don't truncate at new lines (#6907) — @aibrahim
feat: arcticfox in the wild (#6906) — @aibrahim
[app-server] populate thread>turns>items on thread/resume (#6848) — @owenlin0
nit: useless log to debug (#6898) — @jif
fix(core) Support changing /approvals before conversation (#6836) — @dylan.hurd
chore: consolidate compaction token usage (#6894) — @jif
chore(app-server) world-writable windows notification (#6880) — @dylan.hurd
fix: parallel tool call instruction injection (#6893) — @jif
nit: stable (#6895) — @jif
feat: warning large commits (#6838) — @jif
fix label (#6892) — @tibo
Move shell to use truncate_text (#6842) — @aibrahim
Run remote auto compaction (#6879) — @pakrym
flaky-unified_exec_formats_large_output_summary (#6884) — @aibrahim
shell_command returns freeform output (#6860) — @pakrym
chore(core) arcticfox (#6876) — @dylan.hurd
fix(tui) ghost snapshot notifications (#6881) — @dylan.hurd
fix: typos in model picker (#6859) — @aibrahim
chore: update windows docs url (#6877) — @ae
feat: tweak windows sandbox strings (#6875) — @ae
fix: add more fields to ThreadStartResponse and ThreadResumeResponse (#6847) — @mbolin
chore: update windows sandbox docs (#6872) — @ae
Remote compaction on by-default (#6866) — @pakrym
[app-server] introduce turn/completed v2 event (#6800) — @celia
update credit status details (#6862) — @zhao
tui: add branch to 'codex resume', filter by cwd (#6232) — @172423086+nornagon-openai
smoketest for browser vuln, rough draft of Windows security doc (#6822) — @iceweasel
windows sandbox: support multiple workspace roots (#6854) — @iceweasel
updating codex backend models (#6855) — @zhao
exec-server (#6630) — @172423086+nornagon-openai
Fix tests so they don't emit an extraneous config.toml in the source tree (#6853) — @etraut
[app-server-test-client] feat: auto approve command (#6852) — @owenlin0
Improved runtime of generated_ts_has_no_optional_nullable_fields test (#6851) — @etraut
fix: local compaction (#6844) — @jif
Fix typo in config.md for MCP server (#6845) — @simcoea
[codex][otel] support mtls configuration (#6228) — @apanasenko
feat: review in app server (#6613) — @jif
chore(config) enable shell_command (#6843) — @dylan.hurd
Prompt to turn on windows sandbox when auto mode selected. (#6618) — @iceweasel
Add the utility to truncate by tokens (#6746) — @aibrahim
Update faq.md section on supported models (#6832) — @adpena
fixing localshell tool calls (#6823) — @zhao
feat: enable parallel tool calls (#6796) — @jif
feat: remote compaction (#6795) — @jif
nit: app server (#6830) — @jif
nit: mark ghost commit as stable (#6833) — @jif
feat: git branch tooling (#6831) — @jif
:bug: fix(rmcp-client): refresh OAuth tokens using expires_at (#6574) — @LaelLuo
fix(windows) shell_command on windows, minor parsing (#6811) — @dylan.hurd
chore(core) Add shell_serialization coverage (#6810) — @dylan.hurd
Update defaults to gpt-5.1 (#6652) — @aibrahim
Demote function call payload log to debug to avoid noisy error-level stderr (#6808) — @cassirer
execpolicy2 extension (#6627) — @zhao
[app-server] feat: add v2 command execution approval flow (#6758) — @owenlin0
background rate limits fetch (#6789) — @zhao
move cap_sid file into ~/.codex so the sandbox cannot overwrite it (#6798) — @iceweasel
Fix TUI issues with Alt-Gr on Windows (#6799) — @etraut
core: add a feature to disable the shell tool (#6481) — @172423086+nornagon-openai
chore(core) Update shell instructions (#6679) — @dylan.hurd
fix: annotate all app server v2 types with camelCase (#6791) — @owenlin0
LM Studio OSS Support (#2312) — @rugved
[app-server] add events to readme (#6690) — @celia
core/tui: non-blocking MCP startup (#6334) — @172423086+nornagon-openai
chore: delete chatwidget::tests::binary_size_transcript_snapshot tui test (#6759) — @owenlin0
feat: execpolicy v2 (#6467) — @zhao
nit: personal git ignore (#6787) — @jif
tmp: drop sccache for windows 2 (#6775) — @jif
feat: placeholder for image that can't be decoded to prevent 400 (#6773) — @jif
fix(core) serialize shell_command (#6744) — @dylan.hurd
Fix FreeBSD/OpenBSD builds: target-specific keyring features and BSD hardening (#6680) — @jinxiaoyong
Exempt the "codex" github user from signing the CLA (#6724) — @etraut
chore(deps): bump actions/github-script from 7 to 8 (#6755) — @49699333+dependabot[bot]
Fix: Claude models return incomplete responses due to empty finish_reason handling (#6728) — @dulikaifazr
Fix AltGr/backslash input on Windows Codex terminal (#6720) — @pornotato
Revert "tmp: drop sccache for windows (#6673)" (#6751) — @etraut
fix: resolve Windows MCP server execution for script-based tools (#3828) — @jlee14281
Fix documentation errors for Custom Prompts named arguments and add canonical examples (#5910) — @169171880+Sayeem3051
Tighten panic on double truncation (#6701) — @aibrahim
Improve compact (#6692) — @aibrahim
Refactor truncation helpers into its own file (#6683) — @aibrahim
Revert "templates and build step for validating/submitting winget package" (#6696) — @aibrahim
ci: only run CLA assistant for openai org repos (#6687) — @joshka
Handle "Don't Trust" directory selection in onboarding (#4941) — @viniciusmotta8
Ignore unified_exec_respects_workdir_override (#6693) — @pakrym
Order outputs before inputs (#6691) — @pakrym
feat: add app-server-test-client crate for internal use (#5391) — @owenlin0
fix codex detection, add new security-focused smoketests. (#6682) — @iceweasel
feat(ts-sdk): allow overriding CLI environment (#6648) — @lopopolo
templates and build step for validating/submitting winget package (#6485) — @iceweasel
Add test timeout (#6612) — @pakrym
Enable TUI notifications by default (#6633) — @172423086+nornagon-openai
tmp: drop sccache for windows (#6673) — @jif
[App server] add mcp tool call item started/completed events (#6642) — @celia
feat: cache tokenizer (#6609) — @jif
feat: better UI for unified_exec (#6515) — @jif
feat: add resume logs when doing /new (#6660) — @jif
tests: replace mount_sse_once_match with mount_sse_once for SSE mocking (#6640) — @pakrym
Promote shared helpers for suite tests (#6460) — @aibrahim
Use shared network gating helper in chat completion tests (#6461) — @aibrahim
Avoid double truncation (#6631) — @aibrahim
Revert "Revert \"Overhaul shell detection and centralize command generation for unified exec\"" (#6607) — @pakrym
[app-server] small fixes for JSON schema export and one-of types (#6614) — @owenlin0
[App-server] add new v2 events:item/reasoning/delta, item/agentMessage/delta & item/reasoning/summaryPartAdded (#6559) — @celia
chore(core) Consolidate apply_patch tests (#6545) — @dylan.hurd
Only list failed tests (#6619) — @pakrym
feat: Add support for --add-dir to exec and TypeScript SDK (#6565) — @33551757+danfhernandez
Add AbortSignal support to TypeScript SDK (#6378) — @33551757+danfhernandez
Enable close-stale-contributor-prs.yml workflow (#6615) — @pakrym
Update default yield time (#6610) — @pakrym
Close stale PRs workflow (#6594) — @pakrym
Migrate prompt caching tests to test_codex (#6605) — @pakrym
Revert "Overhaul shell detection and centralize command generation for unified exec" (#6606) — @pakrym
Overhaul shell detection and centralize command generation for unified exec (#6577) — @pakrym