1.4.0:

• Expand prompt caching support:
  • Add top-level cache_control on CreateMessage (automatic caching).
  • Add ttl support on CacheControl via CacheTTL.
  • Add cache-control helpers:
    • ephemeralCacheWithTTL
    • ephemeralCacheWithTTLSeconds
    • ephemeralCacheWithTTLDuration
• Add structured system prompt support:
  • SystemPrompt (string or blocks)
  • SystemBlock with per-block cache_control
  • systemText, systemBlocks, systemTextBlock, systemTextBlockCached
  • CreateMessage.system and CountTokensRequest.system now use Maybe SystemPrompt
  • breaking: system = Just someTextVar (where someTextVar :: Text) now needs system = Just (systemText someTextVar)
• Add tool-level cache control support:
  • ToolDefinition variants now accept optional cache_control
  • new helper withToolCacheControl

1.3.1:

• Remove advanced-tool-use-2025-11-20 beta header requirement — tool search, programmatic tool calling, and code execution are now generally available
• Fix flaky PTC test by handling non-deterministic model behavior

1.3.0:

• Add request support for Claude Opus 4.6 routing and speed controls:
  • inference_geo on CreateMessage
  • speed on CreateMessage with SpeedStandard / SpeedFast
• Add context management/compaction request types:
  • context_management on CreateMessage
  • ContextManagementConfig, ContextManagementEdit
  • CompactionTrigger and inputTokensTrigger helper
• Add live API tests for:
  • inference_geo
  • context_management compaction (compact-2026-01-12)
  • speed = fast (fast-mode-2026-02-01, including waitlist-gated handling)

1.2.0:

• Add Thinking type with ThinkingAdaptive and ThinkingEnabled constructors
  • thinking field on CreateMessage
  • ContentBlock_Thinking and ContentBlock_Redacted_Thinking response blocks
  • Content_Thinking and Content_Redacted_Thinking for replaying thinking in multi-turn
  • Delta_Thinking_Delta and Delta_Signature_Delta for streaming
• Add Model_Context_Window_Exceeded constructor to StopReason

1.1.0:

• Replace output_format with output_config on CreateMessage (breaking change)
  • New OutputConfig type with effort and format fields
  • effortConfig helper for effort-only configuration
  • jsonSchemaConfig helper for structured output configuration
• Remove beta header requirement for structured outputs (now GA)

1.0.1:

• Add structured outputs support (beta feature structured-outputs-2025-11-13)
  • OutputFormat type and jsonSchemaFormat helper for JSON outputs
  • output_format field on CreateMessage
  • strict field on Tool and strictFunctionTool helper for strict tool validation
  • additionalProperties field on InputSchema
  • Refusal constructor for StopReason
• Add claude-structured-outputs-example

1.0.0:

• Initial release