[BOT ISSUE] Anthropic: add missing claude-mythos-5 and anthropic.claude-mythos-5 (re-removed by sync)

[github-actions]

Summary

The top-level claude-mythos-5 and Bedrock-variant anthropic.claude-mythos-5 entries are missing from the model catalog. The global.anthropic.claude-mythos-5 entry exists (line ~8403 in model_list.json) but has a dangling parent: "anthropic.claude-mythos-5" reference pointing to the missing Bedrock entry.

This model has been added and removed multiple times by the LiteLLM sync process — see prior issues #814, #982, #1049, #1249. The root cause is that claude-mythos-5 is not listed in SYNC_PRESERVED_FIELDS in packages/proxy/scripts/sync_models.ts, so each sync run removes the manually-added entries.

Missing model IDs

Model ID	Provider	Notes
claude-mythos-5	anthropic	Top-level Anthropic API entry
anthropic.claude-mythos-5	bedrock	Bedrock-variant entry, referenced as parent by global.anthropic.claude-mythos-5

Verified pricing (Anthropic pricing page)

• Input: $10 / 1M tokens
• Output: $50 / 1M tokens
• Cache read: $1 / 1M tokens
• Cache write (5 min): $12.50 / 1M tokens
• Reasoning, reasoning_budget: true
• Multimodal: true
• Max input: 1,000,000 tokens
• Max output: 128,000 tokens

Template

Use claude-mythos-5-1 (line ~8568) as a structural template. The new claude-mythos-5 entry should be identical except:

• input_cache_read_cost_per_mil_tokens: 1 (not 0.25)
• No deprecation_date
• fallback_models: ["anthropic.claude-mythos-5", "global.anthropic.claude-mythos-5"]

Fix must also

Add claude-mythos-5 to SYNC_PRESERVED_FIELDS in packages/proxy/scripts/sync_models.ts to prevent the LiteLLM sync from removing it again. This is the fourth+ time this model has been re-removed.

Cross-verification sources

1. Anthropic pricing page (platform.claude.com/docs/en/about-claude/pricing) — lists claude-mythos-5 with $10/$50 pricing and cache tiers
2. Anthropic models overview — lists Claude Mythos 5 as a current production model
3. Existing global.anthropic.claude-mythos-5 entry in the catalog confirms the model spec

{
  "provider": "anthropic",
  "kind": "missing_model",
  "model_ids": ["claude-mythos-5", "anthropic.claude-mythos-5"]
}

[github-actions]

Closing this bot issue because claude-mythos-5, anthropic.claude-mythos-5 are on the permanent sync-exclusion list (MANUAL_SYNC_EXCLUDED_MODELS / deprecated_model_ids.json in sync_models.ts) or a Perplexity Gateway (router) model the proxy cannot route, and must not be auto-added to the catalog.