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Lance Martin b29e7cf65e Update claude-api skill: Claude Opus 5 (#1476 )

* Update claude-api skill: Claude Opus 5

- Add Claude Opus 5 (`claude-opus-5`) as the default model across all
  SDK examples, model tables, pricing, and migration guidance.
- Add an Opus 5 migration section covering the API changes that come
  with it, and move Opus 4.8 into the previous-generation slot.
- Drop the Opus 4.7 fast-mode guidance, which no longer applies.
- Scope the server-side fallbacks beta header to the current version.

* Update claude-api skill: Opus 5 fast-follow corrections

- Server-side refusal fallbacks are available on Claude Platform on AWS,
  not just the Claude API. Correct the availability statements in
  SKILL.md, the migration guide, and the platform-availability table.
- Simplify the effort guidance: start at `high` (the API default) and
  sweep down, rather than starting at `xhigh` for coding work.
- Add a time-to-first-token section with the prompt instruction that
  reduces pre-answer thinking on latency-sensitive routes.
- Replace the two separate thinking-disabled mitigations with the single
  combined instruction that covers both failure modes.

2026-07-24 16:12:34 -04:00

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Platform Availability

Which features work on which provider platform. This table is the single source of truth in this skill — per-feature sections elsewhere point here instead of restating availability. When writing code for a third-party platform (Bedrock, Vertex, Foundry) or Claude Platform on AWS, check this table first; a feature not supported there means use the first-party Claude API surface or a different approach.

Columns: 1P = first-party Claude API, P-AWS = Claude Platform on AWS (Anthropic-operated, same-day parity), Bedrock = Amazon Bedrock, Vertex = Google Cloud Vertex AI, Foundry = Microsoft Foundry. ✅ = GA, β = beta, ❌ = not supported.

Feature	1P	P-AWS	Bedrock	Vertex	Foundry	Notes
Messages, streaming, tool use	✅	✅	✅	✅	✅	Core API
PDF input	✅	✅	✅	✅	β
Structured outputs / strict tool use	✅	✅	✅	✅	β
Adaptive thinking / effort	✅	✅	✅	✅	β
Extended thinking	✅	✅	✅	✅	β
Prompt caching (5m, 1h)	✅	✅	✅	✅	β
Automatic prompt caching	✅	✅	❌	❌	β
Token counting	✅	✅	✅	✅	β
Citations	✅	✅	✅	✅	β
Search results content blocks	✅	✅	✅	✅	β
Fine-grained tool streaming	✅	✅	✅	✅	✅
Compaction	β	β	β	β	β
Context editing	β	β	β	β	β
Context windows (1M)	✅	✅	✅	✅	β
`inference_geo` (data residency)	✅	✅	❌	❌	❌
Server-side tools
Web search	✅	✅	❌	✅	β	Vertex: basic `web_search_20250305` only (no `_20260209` dynamic filtering)
Web fetch	✅	✅	❌	❌	β
Code execution	✅	✅	❌	❌	β
Tool search	✅	✅	✅	✅	β	Bedrock: InvokeModel API only, not Converse
Advisor tool	β	β	❌	❌	❌
Client-implemented tools
Bash, text editor, memory	✅	✅	✅	✅	β
Computer use	β	β	β	β	β
Agentic / orchestration
Agent Skills (Messages API)	β	β	❌	❌	β
Programmatic tool calling	✅	✅	❌	❌	β
MCP connector	β	β	❌	❌	β
Managed Agents	β	β	❌	❌	❌	Foundry ❌ inferred (not in Foundry docs either way)
Self-hosted sandboxes	β	β	❌	❌	❌	P-AWS: `GET /v1/environments/{id}/work` list endpoint not supported; other work endpoints OK
API endpoints
Message Batches	✅	✅	❌	❌	❌
Files API	β	β	❌	❌	β
Models API	✅	✅	❌	❌	❌
Other
Mid-conversation system messages	✅	✅	❌	❌	❌	Claude Opus 5, Claude Opus 4.8, Claude Fable 5, Claude Mythos 5; not Claude Sonnet 5
Server-side `fallbacks`	β	β	❌	❌	❌	`"default"` → beta `server-side-fallback-2026-07-01`; array form → beta `server-side-fallback-2026-06-01`
Fast mode	β	❌	❌	❌	❌	Research preview, beta `fast-mode-2026-02-01`, first-party API only
Cache diagnostics	β	❌	❌	❌	❌	First-party API only
Task budgets	β	β	❌	❌	❌	Beta header `task-budgets-2026-03-13`; 3P availability not documented — assume unsupported

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Platform Availability

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