[BUG] 1M context window removed from Desktop Code tab model picker after v1.1.7714 update on Max plan

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/34143
2. https://github.com/anthropics/claude-code/issues/34333
3. https://github.com/anthropics/claude-code/issues/34083

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🤖 Generated with Claude Code

I think this issue is specific to Code tab within Claude Desktop. It was working until I updated this morning (March 19th)

I'm furious with Anthropic. The exact same thing happened to me. I'm a MAX subscriber, I use Claude Desktop with code on Windows, and to top it all off, when I got the subscription I was in the middle of a major refactoring of the software I was working on. The update broke my session and ruined a lot of work I'd already done. I had to back up my code because when the tokens were reduced, Claude Opus 4.6 went haywire and corrupted the code. A big slap on the wrist for Anthropic.

I've spent a hell of a lot of time debugging this and can add some specificity from my main.log that narrows the regression window:

2026-03-19 18:36:58 — LocalAgentModeSessionManager → model: claude-opus-4-6[1m]  ← working
2026-03-19 19:59:06 — LocalAgentModeSessionManager → model: claude-opus-4-6       ← [1m] gone
2026-03-20 16:04:28 — LocalAgentModeSessionManager → model: claude-opus-4-6       ← still gone

The [1m] suffix disappeared between 18:36 and 19:59 UTC on March 19 — which lines up exactly with the ["Elevated errors on Claude Opus 4.6" incident] that was marked resolved at 16:16 UTC that day.

Theory behind it: the incident resolution disabled or reset the 1M entitlement flag server-side for some subset of Max accounts.

What I've tried and hasn't worked (Claude desktop app + cowork on Mac)

• Clearing oauth:tokenCache from ~/Library/Application Support/Claude/config.json → no effect
• Setting ANTHROPIC_DEFAULT_OPUS_MODEL: "claude-opus-4-6[1m]" in ~/.claude/settings.json → only affects CLI, Cowork ignores it entirely (of course it does, but I'm trying everything at this point).
• Full logout + login → no re-evaluation of model entitlements (what a surprise).
• Quit app + relaunch → model stays at standard 200K (this was the first recommendation from Claude's useless support agent, so helpful).
• Reset App Data from the app menu → does not clear the stale entitlement cache (confirming @EricPotratz 's s1mAccessCache finding)

The supported-features-info.json in my logs still shows yukonSilver: supported and yukonSilverGems: supported, so the feature flags for Cowork itself are fine.. it's specifically the 1M model variant entitlement that's broken.

This needs a server-side fix. Either the s1mAccessCache needs to be reset for affected accounts, or the entitlement check that runs during LocalAgentModeSessionManager model resolution needs to be patched.

---

Hope this helps - ya'll are not crazy, this is very frustrating that we are paying $200/month for degraded service/features while Anthropic Support gaslights us like there's no issue.

Same issue here. Max plan, Claude for Windows v1.1.7714, Windows 11.

Timeline:

• Had 1M context working for ~2 days
• After the v1.1.7714 update on March 19, context dropped back to 200K
• tengu_hawthorn_window in .claude.json is set to 200000 by the server
• cachedExtraUsageDisabledReason: "org_level_disabled" keeps reappearing after deletion

What I've tried (none worked for Desktop Code tab):

• Deleting .claude.json (regenerated with 200K by server)
• Patching tengu_hawthorn_window to 1000000 (overwritten on next session)
• Removing cachedExtraUsageDisabledReason (comes back)
• Clearing Desktop caches (Cache, Session Storage, Local Storage, fcache)
• Full app restart
• Setting ANTHROPIC_DEFAULT_OPUS_MODEL=claude-opus-4-6[1m] in ~/.claude/settings.json — works for CLI but Desktop Code tab ignores it
• No DISABLE_TELEMETRY or CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC set anywhere

Confirming @evanjcosgrove's analysis — this is a server-side entitlement issue that needs to be fixed by Anthropic. Local workarounds cannot override the Desktop's LocalAgentModeSessionManager model resolution.

Same issue here

Even worse for me.

I can not continue all the different COWORK sessions (projects) I used when the 1M context was available.
Whatever I type in there brings the "Prompt to long" error and I have no options.

Now I wait and hope the 1M context window for Cowork (with Max 20x Plan) comes back quick !!!

And boy did the 1M context made a difference for me. Now with the much smaller window claude feels like he forgets what he did 20 minutes ago frequently. This basically never happend with the 1M window.

I WANT IT BACK... PLEASE :-)

Same issue on Mac!

just updated to 2.1.89 and this happened to me in claude code. I think this was fixed for a bit and now it is back. When I manually try to set the model to 1m it tells me its not available on my account and links me to documentation that says it is infact available on max plan.

I use Claude Code in my terminal on the Max Plan, and I lost the 1M context window yesterday. It now automatically compacts and stops working with original 200K windows. Very frustrating. It had worked since they initially provided the upgrade, but regressed just yesterday for the first time. I really hope Anthropic address this issue soon, it's not just a display issue, the actual context window is limited to 200K.

I actually found a work around. If I run the command /model Opus[1M] it will in fact return to using the 1M context window. However, if your run the command /model Opus (without actually specifying the 1M) it will revert back to the 200K window.

Same issue here.... anthropic is full of bugs......

In my case just running the command to switch manually (/model claude-opus-4-6[1m]) got it back

I am having the same issue on windows

Note for VSCode extension users: /model opus[1m] from the comments here does NOT work in the Code tab ("not available in this environment"). It's CLI-only.

If you're in the VSCode extension and the 1M option disappeared from the picker, the env var workaround from #50083 works:

Add to ~/.claude/settings.json:

{
  "model": "claude-opus-4-6[1m]",
  "env": {
    "CLAUDE_CODE_MAX_CONTEXT_TOKENS": "1000000",
    "DISABLE_COMPACT": "1"
  }
}

Restart -> /context shows 1M. Confirmed working May 19, 2026.

Also be aware that Anthropic's unpinOpus47LaunchEffort migration can silently remove your model field (#60240). Back up your settings.json after configuring.

Note for VSCode extension users: /model opus[1m] from the comments here does NOT work in the Code tab ("not available in this environment"). It's CLI-only. If you're in the VSCode extension and the 1M option disappeared from the picker, the env var workaround from #50083 works: Add to ~/.claude/settings.json: { "model": "claude-opus-4-6[1m]", "env": { "CLAUDE_CODE_MAX_CONTEXT_TOKENS": "1000000", "DISABLE_COMPACT": "1" } } Restart -> /context shows 1M. Confirmed working May 19, 2026. Also be aware that Anthropic's unpinOpus47LaunchEffort migration can silently remove your model field (#60240). Back up your settings.json after configuring.

worked for me

same thing for Sonnet, just the manual fix in ~/.claude/settings.json doesn't work

{
  "model": "claude-sonnet-4-6[1m]",
  "env": {
    "CLAUDE_CODE_MAX_CONTEXT_TOKENS": "1000000",
    "DISABLE_COMPACT": "1"
  }
}

Same on the Desktop App:

<img width="1525" height="721" alt="Image" src="https://github.com/user-attachments/assets/52c6198d-76de-4054-9b61-576aa528d6dc" />