Anthropic Bedrock request fails because SDK sends deprecated temperature parameter for Opus models

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#1,557 opened on Jun 2, 2026 5 comments 4 reactions 1 assignee View on GitHub

@roji is already working on this.

Since Jun 3, 2026.

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Description

bug

When using Copilot SDK with Anthropic provider via Bedrock Mantle, Opus 4.7 and 4.8 inference fails with HTTP 400 because the upstream API rejects temperature for this model.

Error:
400 invalid_request_error: temperature is deprecated for this model.

Environment:

@github/copilot-sdk: 1.0.0 (also seen previously on 1.0.0-beta.12)
Runtime: Node.js on macOS
Provider: Anthropic via Bedrock Mantle
Model: anthropic.claude-opus-4-7/anthropic.claude-opus-4-8

Code to replicate:

import { CopilotClient, approveAll } from "@github/copilot-sdk";

const client = new CopilotClient();

await client.start();
const session = await client.createSession({
  onPermissionRequest: approveAll,
  provider: {
    type: "anthropic",
    baseUrl: `https://bedrock-mantle.${process.env.AWS_REGION}.api.aws/anthropic`,
    apiKey: process.env.BEDROCK_API_KEY,
    modelId: "anthropic.claude-opus-4-7", // Or "anthropic.claude-opus-4-8"
  },
});

const response = await session.sendAndWait({
  prompt: "List tools and skills.",
});

console.log(response);

await session.disconnect();

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