[Bug]: Claude 4.6+ fails silently (temperature+top_p) + outdated retired model list

[anatoliesernii]

Bug report

opencommit version: 3.3.2 (npm i -g opencommit@latest)

Environment: macOS, Node v24, OCO_AI_PROVIDER=anthropic

Summary

Using current Anthropic models with opencommit fails in two ways that together look like an infinite hang on "Generating the commit message":

1. claude-sonnet-4-6 (and other 4.6+ models) still send both temperature and top_p — PR fix(anthropic): remove top_p parameter for Claude 4.5 models #521 only exempts models matching claude.*-4-5, so 4.6+ still hit Anthropic's 400 error.
2. That 400 is misclassified as ModelNotFoundError because isModelNotFoundMessage() treats any message containing both "model" and "invalid" as a missing model. opencommit then opens the interactive model picker behind the spinner, which looks like a forever hang.

Additionally, the built-in Anthropic model list and fallback picker only offer retired models (as of June 15, 2026), so every suggested alternative also fails.

Related: #520 / PR #521 (fixed 4.5 only)

---

Steps to reproduce

npm i -g opencommit@latest
oco config set OCO_AI_PROVIDER=anthropic OCO_API_KEY=<key> OCO_MODEL=claude-sonnet-4-6
git add .
oco

Observed: Spinner stays on "Generating the commit message" indefinitely (or shows model picker with only retired models).

---

Root cause 1: top_p still sent for Claude 4.6+

src/engine/anthropic.ts (master as of 2026-06-22):

// add top_p for non-4.5 models
if (!/claude.*-4-5/.test(params.model)) {
  params.top_p = 0.1;
}

For claude-sonnet-4-6, this adds top_p: 0.1 alongside temperature: 0. Anthropic returns:

{
  "type": "error",
  "error": {
    "type": "invalid_request_error",
    "message": "`temperature` and `top_p` cannot both be specified for this model. Please use only one."
  }
}

---

Root cause 2: 400 misclassified → spinner + hidden model picker

src/utils/engineErrorHandler.ts:

function isModelNotFoundMessage(message: string): boolean {
  const lowerMessage = message.toLowerCase();
  return (
    (lowerMessage.includes('model') &&
      (lowerMessage.includes('not found') ||
        lowerMessage.includes('does not exist') ||
        lowerMessage.includes('invalid') ||  // ← matches the 400 above
        lowerMessage.includes('pull'))) ||
    lowerMessage.includes('does_not_exist')
  );
}

The temperature/top_p error message contains "model" and the JSON type is "invalid_request_error", so it is treated as model-not-found. handleModelNotFoundError() then prompts for an alternative model while the spinner is still running.

---

Root cause 3: outdated default / fallback model list

src/commands/config.ts still lists retired Anthropic models:

• claude-sonnet-4-20250514 (retired 2026-06-15)
• claude-opus-4-20250514 (retired 2026-06-15)
• claude-3-7-sonnet-20250219 (retired 2026-02-19)
• claude-3-5-sonnet-20241022 (retired)
• claude-3-5-haiku-20241022 (retired)

oco models --provider anthropic shows only these. Users upgrading from an old config get stuck in a retry loop with dead models.

---

Expected behavior

• claude-sonnet-4-6, claude-opus-4-8, claude-haiku-4-5, etc. should work out of the box.
• Invalid-parameter 400s should surface as a clear error, not trigger the model picker.
• Default / suggested Anthropic models should be current (per Anthropic deprecations).

---

Suggested fixes

1. src/engine/anthropic.ts — stop sending top_p for all recent Claude models (simplest: remove top_p entirely when temperature is set, or broaden the exemption):

// Don't send both temperature and top_p — unsupported on Claude 4.5+
if (!/claude.*-4-(5|[6-9])/.test(params.model)) {
  params.top_p = 0.1;
}

Or just drop top_p for all Anthropic requests since temperature: 0 is already set.

2. src/utils/engineErrorHandler.ts — tighten isModelNotFoundMessage():

• Remove the broad invalid check, or
• Only match invalid when status is 404, or
• Exclude invalid_request_error / temperature / top_p parameter errors

3. src/commands/config.ts — update MODEL_LIST.anthropic and RECOMMENDED_MODELS:

anthropic: [
  'claude-sonnet-4-6',
  'claude-opus-4-8',
  'claude-haiku-4-5-20251001',
  'claude-sonnet-4-5-20250929',
]

---

Workaround (confirmed)

Until a release ships:

# Option A: use a 4.5 model (exempt from top_p via #521)
oco config set OCO_MODEL=claude-sonnet-4-5-20250929

# Option B: patch global install — broaden regex in out/cli.cjs / src/engine/anthropic.ts

---

Environment details

• opencommit: 3.3.2
• Node: v24.11.1
• Provider: anthropic
• Model tested: claude-sonnet-4-6
• Direct API call with same key + model works; only opencommit's dual-parameter request fails

[di-sukharev]

@anatoliesernii thank you for opening the issue, do you want to fix it with a PR? i will merge it real quick if you tag me

[anatoliesernii]

@di-sukharev hey, thanks for the great tool :)

here you go