Agent terminated error - agent executor error: model unreachable, 503 resopnse

Google Antigravity
1

I experience this error about half the time when using one of the Claude models.

agent terminated due to error

on output pannel

2026-01-26 15:46:15.745 [info] E0126 15:46:15.745735 1702821 log.go:362] agent executor error: model unreachable: request failed: &{503 Service Unavailable 503 HTTP/1.1 1 1 map[Alt-Svc:[h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000] Content-Length:[429] Content-Type:[text/event-stream] Date:[Mon, 26 Jan 2026 06:46:15 GMT] Server:[ESF] Server-Timing:[gfet4t7; dur=546] Vary:[Origin X-Origin Referer] X-Cloudaicompanion-Trace-Id:[f8a9544314b7d25a] X-Content-Type-Options:[nosniff] X-Frame-Options:[SAMEORIGIN] X-Xss-Protection:[0]] 0x143b5ec012c0 429 [] false false map[] 0x143b654f6000 0x143b4cbc8000}: request failed: &{503 Service Unavailable 503 HTTP/1.1 1 1 map[Alt-Svc:[h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000] Content-Length:[429] Content-Type:[text/event-stream] Date:[Mon, 26 Jan 2026 06:46:15 GMT] Server:[ESF] Server-Timing:[gfet4t7; dur=546] Vary:[Origin X-Origin Referer] X-Cloudaicompanion-Trace-Id:[f8a9544314b7d25a] X-Content-Type-Options:[nosniff] X-Frame-Options:[SAMEORIGIN] X-Xss-Protection:[0]] 0x143b5ec012c0 429 [] false false map[] 0x143b654f6000 0x143b4cbc8000}: model api cannot be reached

I am currently on the AI Pro plan. I have tried restarting, logging out and back in, and updating, but nothing has worked.

I am too exhausted to search for a solution anymore because there are simply too many similar errors appearing in the search results…

Antigravity Version: 1.14.2
VSCode OSS Version: 1.104.0
Commit: 450b6b28083d737992adc5d19637f22c95ffba7b
Date: 2026-01-13T02:07:24.766Z (1 wk ago)
Electron: 37.3.1
Chromium: 138.0.7204.235
Node.js: 22.18.0
V8: 13.8.258.31-electron.0
OS: Linux x64 6.17.4-76061704-generic
Language Server CL: 855455936

2

after updating antigravity again to latest version, now the problem is clear

2026-01-26 18:42:32.640 [info] E0126 18:42:32.639859 1727512 log.go:362] UNAVAILABLE (code 503): No capacity available for model claude-opus-4-5-thinking on the server: UNAVAILABLE (code 503): No capacity available for model claude-opus-4-5-thinking on the server

3

i have exactly the same issue,
they don’t have enough servers to handle traffic
and i’m getting these errors hundreds time during a workday
bug

image
image961×564 21 KB

I’ve started filing an issue from time to time. I hope it reaches someone who can fix it.