v1.15.0

What's New

Claude Fable 5 — Anthropic's most capable model, now on Bedrock

You can now use Claude Fable 5 through the native Anthropic Messages API on the bedrock-mantle endpoint. Fable 5 brings a 1M token context window, 128K max output, and always-on reasoning — ideal for complex, multi-step tasks.

let reply = try await bedrock.createMessage(
    "Explain quantum computing",
    with: .claude_fable_v5,
    authentication: .default
)
print(reply.text)

Multi-turn conversations made easy

Building a conversation is as simple as appending strings and replies:

var conversation: [AnthropicMessage] = []
conversation.append("What is quantum computing?")

let reply = try await bedrock.createMessage(
    conversation, with: .claude_fable_v5, authentication: .default
)

conversation.append(reply)
conversation.append("Give me a real-world example")

let followUp = try await bedrock.createMessage(
    conversation, with: .claude_fable_v5, authentication: .default
)

Prerequisites

Claude Fable 5 requires a one-time data retention opt-in before first use. See the Messages API documentation for setup instructions.

What's Changed

• Add Claude Fable 5 support by @sebsto in #89

Full Changelog: v1.14.0...v1.15.0