fix: update Anthropic model metadata for claude-opus-4-1 and claude-opus-4-6-20260205

[github-actions]

fix: update Anthropic model metadata for claude-opus-4-1 and claude-opus-4-6-20260205

Closes #683

Source issue: #683

Summary

Field	Value
Provider	anthropic
Primary model	claude-opus-4-1
Changed models	claude-opus-4-1 claude-opus-4-6-20260205
Added models	None
Updated models	claude-opus-4-1 claude-opus-4-6-20260205
Verification sources	1

Verified metadata

Model	Display name	Parent	Providers	Format	Flavor	Token limits	Pricing	Lifecycle
claude-opus-4-1	Claude 4.1 Opus		anthropic	anthropic	chat	input=200000, output=32000	in/out=15/75 per 1M; cache read=1.5 per 1M; cache write=18.75 per 1M	multimodal=true; reasoning=true
claude-opus-4-6-20260205	Claude 4.6 Opus (2026-02-05)	claude-opus-4-6	anthropic	anthropic	chat	input=1000000, output=128000	in/out=5/25 per 1M; cache read=0.5 per 1M; cache write=6.25 per 1M	parent=claude-opus-4-6; multimodal=true; reasoning=true

Verification notes

Verification

Sources consulted

• Anthropic official docs (https://docs.anthropic.com/en/docs/about-claude/models): Confirms both models are served via the Anthropic Messages API (i.e., "format": "anthropic"). claude-opus-4-1 is listed as a Claude API alias for claude-opus-4-1-20250805 with 200k context / 32k max output / $15/$75 pricing. claude-opus-4-6 (parent of claude-opus-4-6-20260205) is listed with 1M context / 128k max output / $5/$25 pricing.
• Pattern analysis of model_list.json: Every other Claude model with available_providers: ["anthropic"] uses "format": "anthropic". The parent claude-opus-4-6 and sibling claude-opus-4-1-20250805 both correctly use "format": "anthropic".

Fields verified

• format: Changed from "openai" to "anthropic" for both models. Verified by Anthropic docs and catalog consistency.

sync_models (LiteLLM) cross-check

• The format field is not tracked by sync_models (LiteLLM only tracks numeric fields like token limits and pricing), so no cross-check is applicable for this change.
• LiteLLM does not have an entry for claude-opus-4-6-20260205. For claude-opus-4-1, the LiteLLM entry maps to azure_ai provider (not the direct Anthropic provider entry), so it is not directly comparable.
• No numeric fields are being changed in this fix, so no sync_models deviations exist.

Fields not changed

• All other fields (flavor, multimodal, pricing, token limits, displayName, parent, reasoning, available_providers, cache pricing) remain unchanged as they already match official Anthropic documentation.

sync_models vs proposed update

sync_models cross-check found no pricing/token discrepancies for the changed models.

No sync_models discrepancies were noted.

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