[BUG] No minimum CPU requirements check

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?

I'm using VSCode+Remote SSH with Copilot. I wanted to try Claude Code so I installed the extension, which asked to get paid plan. I registered and got Claude.ai PRO.
It doesn't work - turns out my server has too old CPU family and Bun crashes (gets killed after it reach 16G memory usage)
Because I got Claude.ai subscription and not the other one with API tokens now I can't use my Claude subscription for anything but web chat.

What Should Happen?

There should be CPU check before asking the user to get a paid plan.

Error Messages/Logs

VSCode output errors:

26-03-03 16:27:25.498 [info] Received message from webview: {"type":"request","requestId":"nypi4g952i","request":{"type":"rename_tab","title":"Hello","hasPendingPermissions":false,"hasUnseenCompletion":false}}
2026-03-03 16:27:25.504 [info] Received message from webview: {"type":"io_message","channelId":"61t1txueod6","message":{"type":"user","uuid":"7d4fc201-3d8e-4b74-8acd-2177c11dce77","session_id":"","parent_tool_use_id":null,"message":{"role":"user","content":[{"type":"text","text":"<ide_opened_file>The user opened the file /var/www/adm4/web/pages/dhl_packages/scan_package/SingleRow.html in the IDE. This may or may not be related to the current task.</ide_opened_file>"},{"type":"text","text":"Hello"}]}},"done":false}
2026-03-03 16:27:40.127 [info] From claude: ============================================================
Bun v1.3.10 (89a8aa9b) Linux x64 (baseline)
Linux Kernel v5.
2026-03-03 16:27:40.127 [info] From claude: 4.0 | glibc v2.31
Args: "/home/stoycho/.vscode-server/extensions/anthropic.claude-code-2.1.63-linux-x64/resources/native-binary/claude" "--output-format" "stream-json" "--verbose" "--input-format" "stream-json" "--thinking" "disabled" "--model" "de"...
Features: jsc no_avx2 no_avx standalone_executable 
Builtins: "bun:main" 
Elapsed: 59474ms | User: 33556ms | Sys: 25815ms
RSS: 16.10GB | Peak: 8.75GB | Commit: 16.10GB | Faults: 0 | Machine: 33.66GB

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic(main thread): Segmentation fault at address 0x4CC16000000

2026-03-03 16:27:40.128 [info] From claude: oh no: Bun has crashed. This indicates a bug in Bun, not your code.

To send a redacted crash report to Bun's team,
please file a GitHub issue using the link below:

 
2026-03-03 16:27:40.128 [info] From claude: https://bun.report/1.3.10/B_189a8aa9EggggigD47296E+o4QgrrvgDmup9sDkg27sD+6+54Dowq/vE6kjm1Ewmk44F_ijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEA24sCgggggW


2026-03-03 16:27:40.670 [error] Failed to load config cache: Error: Query closed before response received
2026-03-03 16:27:40.670 [error] Error processing client request: Error: Query closed before response received
2026-03-03 16:27:40.739 [info] Received message from webview: {"type":"interrupt_claude","channelId":"0mkz021n3r29"}
2026-03-03 16:27:40.740 [warning] Channel not found: 0mkz021n3r29
2026-03-03 16:27:42.707 [info] From claude: ============================================================
Bun v1.3.10 (89a8aa9b) Linux x64 (baseline)
Linux Kernel v5.4
2026-03-03 16:27:42.707 [info] From claude: .0 | glibc v2.31
Args: "/home/stoycho/.vscode-server/extensions/anthropic.claude-code-2.1.63-linux-x64/resources/native-binary/claude" "--output-format" "stream-json" "--verbose" "--input-format" "stream-json
2026-03-03 16:27:42.708 [info] From claude: " "--max-thinking-tokens" "31999" "-"...
Features: jsc no_avx2 no_avx
2026-03-03 16:27:42.708 [info] From claude:  standalone_executable 
Builtins: "bun:main" 
Elapsed: 62003ms | User: 34651ms | Sys: 27227ms
RSS: 
2026-03-03 16:27:42.708 [info] From claude: 16.10GB | Peak: 8.75GB | Commit: 16.10GB | Faults: 0 | Machine: 33.66GB

CPU lacks AVX support. Please consider upgrading to a newer CPU.
panic
2026-03-03 16:27:42.708 [info] From claude: (main thread): Segmentation fault at address 0x4FA82000000

2026-03-03 16:27:42.709 [info] From claude: oh no: Bun has crashed. This indicates a bug in Bun, not your code.

To send a redacted crash report to Bun's team,
please file a GitHub issue using the link below:

 
2026-03-03 16:27:42.709 [info] From claude: https://bun.report/1.3.10/B_189a8aa9EggggigD47296E+o4QgrrvgDmup9sDkg27sD+6+54Dowq/vE6kjm1Ewmk44F_ijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEijwjrEA20vChgggg+D


2026-03-03 16:27:43.283 [info] Closing Claude on channel: 61t1txueod6
2026-03-03 16:27:43.284 [error] Error from Claude (on channel 61t1txueod6): Error: Claude Code process terminated by signal SIGILL
2026-03-03 16:27:49.501 [info] Received message from webview: {"type":"request","requestId":"8o1tdmewvao","request":{"type":"open_output_panel"}}

This is info from my server:

stoycho@dev.server:/var/www/adm4/web$ cat /proc/cpuinfo | tail -n 27
processor       : 7
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Common KVM processor
stepping        : 1
microcode       : 0x1
cpu MHz         : 2699.998
cache size      : 16384 KB
physical id     : 1
siblings        : 4
core id         : 3
cpu cores       : 4
apicid          : 7
initial apicid  : 7
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx lm constant_tsc nopl xtopology cpuid tsc_known_freq pni cx16 x2apic hypervisor lahf_lm cpuid_fault pti
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit mmio_unknown
bogomips        : 5399.99
clflush size    : 64
cache_alignment : 128
address sizes   : 40 bits physical, 48 bits virtual
power management:
stoycho@dev.server:/var/www/adm4/web$ free -h
              total        used        free      shared  buff/cache   available
Mem:           31Gi       5.3Gi        23Gi       3.0Mi       2.7Gi        25Gi
Swap:         4.0Gi       742Mi       3.3Gi
stoycho@dev.server:/var/www/adm4/web$

Steps to Reproduce

1. Install Claude code in VSCode on server with old CPU family.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_