### Describe the bug

### Describe the bug

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◉ Working esc cancel Claude Sonnet 4.6 · medium · (0%)

Then it use a lot of cpu and does nothing

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2668312 foob 20 0 11.2g 227904 90216 S 62.6 0.2 2:17.65 MainThread

tested v1.0.61 and it works.

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

2026-06-27T09:22:40.299Z [DEBUG] Using GitHub OAuth token for Copilot API

2026-06-27T09:22:40.299Z [DEBUG] Creating copilot-client for integration ID copilot-developer-cli with token authentication. User-agent: copilot/1.0.65 (client/github/cli linux v24.16.0) term/unknown

2026-06-27T09:22:40.300Z [DEBUG] Successfully listed 30 models

2026-06-27T09:22:40.300Z [DEBUG] Listed models: [claude-opus-4.6,Claude Opus 4.6], [claude-opus-4.7,Claude Opus 4.7], [claude-sonnet-4.6,Claude Sonnet 4.6], [gpt-5.3-codex,GPT-5.3-Codex], [gpt-5.4-mini,GPT-5.4 mini], [gpt-5.4-nano,GPT-5.4 nano], [gpt-5.4,GPT-5.4], [gpt-5.5,GPT-5.5], [gpt-5-mini,GPT-5 mini], [gpt-4o-mini-2024-07-18,GPT-4o mini], [gpt-4o-2024-11-20,GPT-4o], [gpt-4o-2024-08-06,GPT-4o], [text-embedding-3-small,Embedding V3 small], [text-embedding-3-small-inference,Embedding V3 small (Inference)], [claude-sonnet-4.5,Claude Sonnet 4.5], [claude-opus-4.5,Claude Opus 4.5], [claude-haiku-4.5,Claude Haiku 4.5], [gemini-2.5-pro,Gemini 2.5 Pro], [gpt-4.1-2025-04-14,GPT-4.1], [gpt-41-copilot,GPT-4.1 Copilot], [gpt-3.5-turbo-0613,GPT 3.5 Turbo], [gpt-4,GPT 4], [gpt-4-0613,GPT 4], [gpt-4o-2024-05-13,GPT-4o], [gpt-4-o-preview,GPT-4o], [gpt-4.1,GPT-4.1], [gpt-3.5-turbo,GPT 3.5 Turbo], [gpt-4o-mini,GPT-4o mini], [gpt-4o,GPT-4o], [text-embedding-ada-002,Embedding V2 Ada]

2026-06-27T09:22:40.301Z [DEBUG] Applied model capabilities override: {"family":"claude-sonnet-4.6","limits":{"max_context_window_tokens":264000,"max_non_streaming_output_tokens":16000,"max_output_tokens":64000,"max_prompt_tokens":200000,"vision":{"max_prompt_image_size":3145728,"max_prompt_images":5,"supported_media_types":["image/jpeg","image/png","image/webp","image/gif","application/pdf"]}},"object":"model_capabilities","supports":{"adaptive_thinking":true,"max_thinking_budget":32000,"min_thinking_budget":1024,"parallel_tool_calls":true,"reasoning_effort":["low","medium","high","max"],"streaming":true,"structured_outputs":true,"tool_calls":true},"tokenizer":"o200k_base","type":"chat"}

2026-06-27T09:22:40.301Z [DEBUG] Got model info: {

  "billing": {

    "restricted_to": [

      "pro",

      "pro_plus",

      "individual_trial",

      "business",

      "enterprise",

      "max"

    ],

    "token_prices": {

      "batch_size": 1000000,

      "default": {

        "cache_read_price": 30,

        "cache_write_price": 375,

        "input_price": 300,

        "max_prompt_tokens": 200000,

        "output_price": 1500

      },

      "long_context": {

        "cache_read_price": 30,

        "cache_write_price": 375,

        "input_price": 300,

        "max_prompt_tokens": 936000,

        "output_price": 1500

      }

    }

  },

  "capabilities": {

    "family": "claude-sonnet-4.6",

    "limits": {

      "max_context_window_tokens": 264000,

      "max_non_streaming_output_tokens": 16000,

      "max_output_tokens": 64000,

      "max_prompt_tokens": 200000,

      "vision": {

        "max_prompt_image_size": 3145728,

        "max_prompt_images": 5,

        "supported_media_types": [

          "image/jpeg",

          "image/png",

          "image/webp",

          "image/gif",

          "application/pdf"

        ]

      }

    },

    "object": "model_capabilities",

    "supports": {

      "adaptive_thinking": true,

      "max_thinking_budget": 32000,

      "min_thinking_budget": 1024,

      "parallel_tool_calls": true,

      "reasoning_effort": [

        "low",

        "medium",

        "high",

        "max"

      ],

      "streaming": true,

      "structured_outputs": true,

      "tool_calls": true

    },

    "tokenizer": "o200k_base",

    "type": "chat"

  },

  "id": "claude-sonnet-4.6",

  "is_chat_default": false,

  "is_chat_fallback": false,

  "model_picker_category": "versatile",

  "model_picker_enabled": true,

  "model_picker_price_category": "medium",

  "name": "Claude Sonnet 4.6",

  "object": "model",

  "policy": {

    "state": "enabled",

    "terms": "Enable access to the latest Claude Sonnet 4.6 model from Anthropic. [Learn more about how GitHub Copilot serves Claude Sonnet 4.6](https://gh.io/copilot-claude-opus)."

  },

  "preview": false,

  "supported_endpoints": [

    "/chat/completions",

    "/v1/messages"

  ],

  "vendor": "Anthropic",

  "version": "claude-sonnet-4.6"

}

2026-06-27T09:22:48.972Z [DEBUG] [Octokit] request

2026-06-27T09:22:48.975Z [DEBUG] [rust:log] starting new connection 'Some("api.github.com")' {"log.target":"reqwest::connect","log.module_path":"reqwest::connect","log.file":"/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/reqwest-0.13.4/src/connect.rs","log.line":929}

2026-06-27T09:22:48.975Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connecting to 140.82.116.5:443

2026-06-27T09:22:48.978Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connected to 140.82.116.5:443

2026-06-27T09:22:49.414Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", api.github.com)

2026-06-27T09:22:49.414Z [INFO] [Octokit] POST /graphql - 200 with id 163E:128A50:5DA289C:5F79229:6A3F9669 in 442ms

2026-06-27T09:23:03.590Z [DEBUG] [rust:runtime::api_telemetry_queue] [telemetry-queue] Flushing 3 events (20252 B → 2828 B gzipped)

2026-06-27T09:23:03.591Z [DEBUG] [rust:hyper_util::client::legacy::pool] reuse idle connection for ("https", telemetry.business.githubcopilot.com)

2026-06-27T09:23:03.881Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", telemetry.business.githubcopilot.com)

2026-06-27T09:23:48.957Z [DEBUG] [Octokit] request

2026-06-27T09:23:48.960Z [DEBUG] [rust:log] starting new connection 'Some("api.github.com")' {"log.target":"reqwest::connect","log.module_path":"reqwest::connect","log.file":"/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/reqwest-0.13.4/src/connect.rs","log.line":929}

2026-06-27T09:23:48.960Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connecting to 140.82.116.5:443

2026-06-27T09:23:48.963Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connected to 140.82.116.5:443

2026-06-27T09:23:49.523Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", api.github.com)

2026-06-27T09:23:49.523Z [INFO] [Octokit] POST /graphql - 200 with id 23FC:262C01:63B4C40:6588B29:6A3F96A4 in 566ms

2026-06-27T09:24:48.957Z [DEBUG] [Octokit] request

2026-06-27T09:24:48.967Z [DEBUG] [rust:log] starting new connection 'Some("api.github.com")' {"log.target":"reqwest::connect","log.module_path":"reqwest::connect","log.file":"/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/reqwest-0.13.4/src/connect.rs","log.line":929}

2026-06-27T09:24:48.968Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connecting to 140.82.116.5:443

2026-06-27T09:24:48.968Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connected to 140.82.116.5:443

2026-06-27T09:24:49.375Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", api.github.com)

2026-06-27T09:24:49.375Z [INFO] [Octokit] POST /graphql - 200 with id 203F:157E5D:66003B4:67D5059:6A3F96E1 in 418ms

2026-06-27T09:25:48.963Z [DEBUG] [Octokit] request

2026-06-27T09:25:48.966Z [DEBUG] [rust:log] starting new connection 'Some("api.github.com")' {"log.target":"reqwest::connect","log.module_path":"reqwest::connect","log.file":"/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/reqwest-0.13.4/src/connect.rs","log.line":929}

2026-06-27T09:25:48.966Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connecting to 140.82.116.6:443

2026-06-27T09:25:48.969Z [DEBUG] [rust:hyper_util::client::legacy::connect::http] connected to 140.82.116.6:443

2026-06-27T09:25:49.425Z [DEBUG] [rust:hyper_util::client::legacy::pool] pooling idle connection for ("https", api.github.com)

2026-06-27T09:25:49.426Z [INFO] [Octokit] POST /graphql - 200 with id 3B3F:262C01:63D327D:65A7DCA:6A3F971D in 462ms

_Originally posted by @wangvisual in https://github.com/github/copilot-cli/issues/3962_

No source files, tests, or reproduction steps are named. Start by confirming whether this belongs in github/copilot-cli and reproduce the high CPU behavior in Copilot CLI v1.0.65, comparing it with v1.0.61 while reviewing the supplied logs. Done means identifying and resolving the regression, with verification that the review command no longer remains idle at high CPU.

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