[BUG] Processus AMD A8-3800 supports SSE4.1/SSE4.2, but not AVX ni AVX2

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Processus AMD A8-3800 supports SSE4.1/SSE4.2, but not AVX and not AVX2
AMD A8-3800, panic: Illegal instruction, claude.exe 2.1.227

What Should Happen?

Claude should be usable and not return
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Error Messages/Logs

2026-08-12 16:25:42 [info] [Lifecycle] Session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5: initializing → running
2026-08-12 16:25:42 [info] [FileWatching] Starting file watcher for session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5: C:\Users\laurent\AppData\Roaming\Claude\local-agent-mode-sessions\80544fe8-2e04-437a-a444-9c8500639b43\21a0b58b-a752-48dc-8315-48e782689845\local_21d8b21b-9963-447c-b47e-8044e7a0c1f5\outputs
2026-08-12 16:25:42 [info] [FileSystemWatcher] Started watching C:\Users\laurent\AppData\Roaming\Claude\local-agent-mode-sessions\80544fe8-2e04-437a-a444-9c8500639b43\21a0b58b-a752-48dc-8315-48e782689845\local_21d8b21b-9963-447c-b47e-8044e7a0c1f5\outputs for session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5
2026-08-12 16:25:42 [warn] [HostLoop] cli.js stderr: ============================================================

panic: Illegal instruction at address 0x7FF687709E55
panicked during a panic. Aborting.
2026-08-12 16:25:42 [error] Session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5 query error: Claude Code process exited with code 3. stderr: ============================================================

panic: Illegal instruction at address 0x7FF687709E55
panicked during a panic. Aborting. { telemetryMessage: 'Claude Code process exited with code 3', errorClass: 'process_exited_nonzero', exitCode: 3, stack: 'Error: Claude Code process exited with code 3. stderr: ============================================================\n\npanic: Illegal instruction at address 0x7FF687709E55\npanicked during a panic. Aborting.\n    at ZJ.getProcessExitError (C:\\Program Files\\WindowsApps\\Claude_1.28929.0.0_x64__pzs8sxrjxfjjc\\app\\resources\\app.asar\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:10754)\n    at ChildProcess.n (C:\\Program Files\\WindowsApps\\Claude_1.28929.0.0_x64__pzs8sxrjxfjjc\\app\\resources\\app.asar\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:14948)\n    at Object.onceWrapper (node:events:631:26)\n    at ChildProcess.emit (node:events:521:24)\n    at m (C:\\Program Files\\WindowsApps\\Claude_1.28929.0.0_x64__pzs8sxrjxfjjc\\app\\resources\\app.asar\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:4581)\n    at ChildProcess.<anonymous> (C:\\Program Files\\WindowsApps\\Claude_1.28929.0.0_x64__pzs8sxrjxfjjc\\app\\resources\\app.asar\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:4771)\n    at Object.onceWrapper (node:events:631:26)\n    at ChildProcess.emit (node:events:521:24)\n    at ChildProcess._handle.onexit (node:internal/child_process:295:12)' }
2026-08-12 16:25:42 [info] [Lifecycle] Session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5: running → idle
2026-08-12 16:25:42 [info] [FileWatching] Stopping file watcher for session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5
2026-08-12 16:25:42 [info] [FileSystemWatcher] Stopped watching for session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5
2026-08-12 16:25:42 [info] [CycleHealth] Unhealthy cycle: {
  session_id: 'local_21d8b21b-9963-447c-b47e-8044e7a0c1f5',
  scheduled_task_id: null,
  variant_key: '06_22_2026.replace',
  session_built_prompt: true,
  space_id: undefined,
  session_type: undefined,
  parent_session_id: undefined,
  host_loop_mode: true,
  vm_instance_id: '7c717c00-d01d-413f-b122-4c4134dc272e',
  model: 'claude-sonnet-5',
  permission_mode: null,
  cli_session_id: null,
  user_message_uuid: '93807608-9638-4d87-9b44-80894b5599da',
  cycle_health: 'unhealthy',
  had_first_response: false,
  seconds_to_outcome: 1,
  is_resume: false,
  unhealthy_reason: 'system_error',
  error_message: 'Claude Code process exited with code 3. stderr: ============================================================\n' +
    '\n' +
    'panic: Illegal instruction at address 0x7FF687709E55\n' +
    'panicked during a panic. Aborting.',
  error_category: 'process_crashed',
  transcript_size_bytes: undefined,
  msix_identity_source: 'native_ok',
  msix_fs_virtualized: true,
  cli_binary_source: 'required_version',
  probe_child_virtual_view: 'pending'
}
2026-08-12 16:25:42 [error] Sentry caught: {
  eventId: '289118c183e242acb52ed6258dd24eaf',
  type: 'Error',
  value: 'Claude Code process exited with code 3. stderr: ============================================================\n' +
    '\n' +
    'panic: Illegal instruction at address 0x7FF687709E55\n' +
    'panicked during a panic. Aborting.',
  stack: 'Error: Claude Code process exited with code 3. stderr: ============================================================\n' +
    '\n' +
    'panic: Illegal instruction at address 0x7FF687709E55\n' +
    'panicked during a panic. Aborting.\n' +
    '    at ZJ.getProcessExitError (app://\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:10754)\n' +
    '    at ChildProcess.n (app://\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:14948)\n' +
    '    at Object.onceWrapper (node:events:631:26)\n' +
    '    at ChildProcess.emit (node:events:521:24)\n' +
    '    at m (app://\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:4581)\n' +
    '    at ChildProcess.<anonymous> (app://\\.vite\\build\\index2.chunk-DiaQ9Xz9.js:95:4771)\n' +
    '    at Object.onceWrapper (node:events:631:26)\n' +
    '    at ChildProcess.emit (node:events:521:24)\n' +
    '    at ChildProcess._handle.onexit (node:internal/child_process:295:12)'
}
2026-08-12 16:25:42 [info] [MsixSpawnDiag] probe result: visible
2026-08-12 16:25:43 [warn] Transcript not found for session local_21d8b21b-9963-447c-b47e-8044e7a0c1f5 (cliSessionId: none)

Steps to Reproduce

It seems only with a AMD A8-3800

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Version 1.28929.0 (d1a6bc)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_