Model not found (not_found_error)
A requested model id is unavailable to this account or was retired.
83 issues · 4 open · 79 resolved (95%) · first seen Jun 24, 2025
First response · api
What to do now
Most likely: The API rejected or could not complete the request.
- Identify the HTTP status and error type before changing local configuration.
- Retry once with a short backoff; repeated failures should be compared with the official status page.
- If only one project fails, reproduce in a new short session to separate service trouble from request state.
These are conservative triage steps, not an official Anthropic fix. Use the issue and workaround evidence below before making a destructive configuration change.
Is this getting better or worse?
This class of problem is converging. 13 new reports in the last 90 days vs 31 in the 90 before — -58%. The open backlog peaked at 9 in 2026-03 and sits at 4 today.
Derived by counting each matching issue from its creation date until it closed. First-party
computation over the anthropics/claude-code tracker — the trend is not published
anywhere upstream.
Which builds report this
41 of these reports name the Claude Code build they were running, spanning 29 releases. Heaviest reporters:
- Claude Code v2.1.92
- Claude Code v2.1.81
- Claude Code v2.0.76
- Claude Code v2.1.98
- Claude Code v2.1.170
- Claude Code v2.1.119
- Claude Code v2.1.97
- Claude Code v2.1.71
Report volume, not a defect count: an issue can mention a build without that build having caused the failure. Versions come from the version string in the bug-report template, matched against real published tags.
Do these get fixed?
Median time to close is 4 days across 79 closures. Of the 79 closures with a recorded reason, 22% were closed as completed and 62 as not-planned or duplicate. The most recent completed fix landed in 2026-08.
Workarounds reported by the community
8 of these issues post a workaround someone says worked. The highest-engagement ones:
- [BUG] Task tool `model` parameter returns 404 - Blocks cost-optimized workflows (10-30x unnecessary spending)
- …full model ID Actual: Test 3: Omit model parameter (current workaround) 5. Omit model parameter: Result: ✅ Works, but inherits Sonnet/Opus (defeats the purpose, 10-30x cost waste) --- Error Messages/Logs --- Technical An…
Found in the description of #18873 · resolved - [BUG] CLI 2.1.145 sends literal "claude-opus-4-7[1m]" as model name on session resume, hits 404, silently falls back to 200K
- …d model name. Tested workaround that did NOT work Tried the workaround from < placed in . After restart, behavior unchanged — still shows and proxy logs confirm the same 404-then-fallback pattern. Possible I entered it i…
Found in the description of #60913 · resolved - [BUG] Agent model shorthand names (sonnet/opus/haiku) cause 404 errors - not translated like Task tool
- …ting System macOS Terminal/Shell zsh Additional Information Workaround : Remove the field from agent definitions so they inherit from parent context, which does handle translation correctly. Related : This is similar to…
Found in the description of #17562 · resolved - Desktop app freezes during large builds — token stream stalls while timer continues
- …ulti-file builds are initiated in the desktop app. The only workaround is to clear the conversation, which destroys all session context. Steps to Reproduce 1. Open Claude Code in the Claude Desktop app 2. Start a large b…
Found in the description of #51193 · resolved - [Bug] Skill frontmatter "model" field causes 404 API error
- …25.3.0) - Available models: Opus 4.5, Sonnet 4.5, Haiku 4.5 Workaround Remove the field from skill frontmatter. The skill will inherit the model from the parent session. References - Documentation: (Frontmatter reference…
Found in the description of #32841 · resolved
Excerpts are quoted from the linked issue so you can judge relevance before opening it. Threads that only ask for a workaround, or report that there is none, are excluded. These are community suggestions, not official guidance from Anthropic — read the full thread before applying one.
Matching issues 1–83
Ranked by community engagement (reactions weighted over comments).
- [BUG] Task tool `model` parameter returns 404 - Blocks cost-optimized workflows (10-30x unnecessary spending)
- Model Selection Fails for Slash Commands with Anthropic API
- [Bug] Model Alias Not Supported in Custom Slash Command Configuration
- [BUG] CLI 2.1.145 sends literal "claude-opus-4-7[1m]" as model name on session resume, hits 404, silently falls back to 200K
- [Bug] Anthropic API Error: Opus model inaccessible from Claude Code despite Team plan access
- Default model in settings.json ("claude-fable-5[1m]") is not honored at session start; /model does not reliably switch either
- [Bug] Teammate process crashes on permission prompt with Ink rendering error: <Box> nested in <Text>
- [BUG] API Error 404: model claude-opus-4-5-20251101 not found - persists across machines and locations
- [FEATURE] Warn users when ANTHROPIC_BASE_URL overrides OAuth/subscription credentials
- 70% util on web dashboard, hitting limits only in claude code
- [BUG]
- [Bug] Hallucination: False User Confirmation from Task Notification and Compaction Events - why are <task-notification>s user content??
- [BUG] Agent model shorthand names (sonnet/opus/haiku) cause 404 errors - not translated like Task tool
- Task tool subagents fail with 404 'model: haiku' regardless of model parameter
- Fetch fails 100% of time (url: "https://64bis.eus", prompt: "Analiza esta...
- [BUG] Claude code fails when I set a model to use for custom commands
- [BUG] "model" option in custom slash command not working
- "Cost Function Fails to Return Calculation Result"
- Feature request: autocomplete/validation for /model command
- [Bug] Anthropic API Error: Invalid Model Name "sonnet"
- [Bug] Anthropic API Error: Invalid Model Name "inherit" for slash commands
- Graceful model version transitions
- [Bug] Anthropic API Error: Model Not Found During Active Session
- [BUG] Internal quota probe sends model ID with literal `[1m]` suffix → 404 not_found_error
- API Error: 400 {"type":"error","error":{"type":"invalid_req...
- [BUG] tools/call never dispatched to stdio MCP servers in Claude Desktop 1.7196.0 (UtilityProcess Check regression)
- [Bug] Permission matcher ignores piped commands, breaking Bash(cmd:*) allowlist rules
- WebFetch tool fails with "model not found" due to invalid model ID format (@ instead of -)
- Auto-updater has a design flaw that causes silent...
- Desktop app freezes during large builds — token stream stalls while timer continues
- There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.
- [Bug] File path validation fails for non-ASCII characters in archived report paths
- just fails with a 500 then apologizes. not helpful
- [BUG] Integrations show "configure" instead of "connected" after successful OAuth
- There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.
- There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.
- There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.
- [BUG] Model selection issue
- Session titles show API 404 error for deprecated model claude-3-5-haiku-20241022
- [Bug] Skill frontmatter "model" field causes 404 API error
- Claude terminal red
- [Bug] claude-opus-4-6 model not recognized despite API availability
- Small models via ANTHROPIC_BASE_URL fail to make tool calls due to excessive tool definitions (259 tools sent)
- Invalid model IDs generated for skills/agents without explicit model specification
- [Feature] Support Opus model for Task tool subagents
- [BUG] Claude Agent SDK Fails with HTTP 404 `not_found_error` for `model="default"`
- Task Tool Model Parameter Causes API 404 Error
- [Bug] `CLAUDE_CODE_SUBAGENT_MODEL` env variable causes plugin agent return 404 errors
- [BUG] Sonnet model returns 404 "model: sonnet" error, Opus works fine
- [Bug] Anthropic API Error: Invalid Model Name for Sonnet
- [Bug] Validation Missing: Incorrect Model Name Not Caught Before API Call
- [BUG] Claude includes mistyped models in /model command as new custom model
- File Encoding Limitation: Edit Tool Overwrites Non-UTF-8 Files
- Claude Code Authentication Failure with Pro Account
- Anthropic API Error: Invalid Model "opus-4" Not Found
- Bug Report
- Missing Tool Result Block in Claude Code Response
- security-guidance: failed LLM review reports "no vulnerabilities found" (fail-quiet); resolved model is never logged
- I have been Using Claude with GUI and I had several named...
- [BUG] Fable 5 unavailability banner suggests "Opus 4.8" but `/model opus 4.8` returns "not found" (v2.1.98)
- [DOCS] Error reference suggests `/model` and `--model` for SDK `model_not_found` errors
- [DOCS] `--fallback-model` docs still say it is ignored in interactive sessions
- [Bug] Model version numbering clarification needed for user expectations
- I appreciate you flagging this concern, but I need to clarify what I can help with. I cannot generate a GitHub issue title based on your request because: 1. **Your request asks me to help deceive users** - You're asking me to repackage Claude's errors wi
- [BUG] Managed Settings page fails to load in Claude Desktop app (Monaco editor init crash)
- You've hit your limit · resets 2pm (America/Cordoba)
- I'm on Max plan but Claude Code think I'm in Pro and not...
- [Bug] Sandbox bash execution fails with iconv_open UTF-8-MAC error in git operations
- [BUG] ollama: model prefix not stripped from API request body
- There's an issue with the selected model (us.anthropic.claude-haiku-4-5-20251001-v1:0). It may not exist or/model to pick a different model. you may not have access to it. Run
- [Bug Report: Unable to process request - no details provided]
- Migrate from deprecated text-embedding-004 to gemini-embedding-001
- [BUG] Managed skill fails with 404 "model: haiku" - invalid model ID
- Anthropic API: Invalid Model Selection - 404 Not Found for "sonnet4"
- [Feature Request] Suggest correct model name on invalid model error using fuzzy matching
- [MODEL]dyld: Symbol not found on macOS 13.x"
- There's an issue with the selected model (claude-haiku-4-5-20251001). It may not exist or you may not have access to it. Run /model to pick a different model.
- Cowork → Customise → Connect hangs after OAuth completes —...
- Prompt injection in Chrome Extension tool-result pipeline: 'Stop Claude' appended to browser responses
- subagents literally never work because my claude pro sub can't use claude-sonnet-4-6-1m
- Model Circumvents Accountability Systems and Lies About Compliance
- [BUG] `/model Fable 5` (the exact name shown in the startup banner) fails with a bare "Model not found" — no did-you-mean, no pointer to the picker
- Just installed claude code, cannot use it with my...