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Claude Opus 4.6 context window limits still 200k #12438
Description
I have manually updated the config for the model, but still get context window limits..
File: /Users/tyler/.config/opencode/opencode.json
1 {
2 "$schema": "https://opencode.ai/config.json",
3 "autoupdate": false,
4 "permission": {
5 "bash": "allow",
6 "doom_loop": "allow",
7 "edit": "allow",
8 "external_directory": "allow",
9 "webfetch": "allow"
10 },
11 "plugin": [
12 "opencode-antigravity-auth@beta",
13 "@mohak34/opencode-notifier@latest",
14 "opencode-anthropic-auth@0.0.13"
15 ],
16 "provider": {
17 "anthropic": {
18 "models": {
19 "claude-opus-4-6": {
20 "limit": {
21 "context": 1000000,
22 "output": 128000
23 },
24 "modalities": {
25 "input": [
26 "text",
27 "image",
28 "pdf"
29 ],
30 "output": [
31 "text"
32 ]
33 },
34 "name": "Claude Opus 4.6"
35 }
36 },
37 "npm": "@ai-sdk/anthropic"
38 },
Reacted by theopicht, Ercin Dedeoglu, Petur Subev, Phil Reynolds, Tino Marques, Jason George, Wei Tu, Brendan Duke, Krishna Penukonda, Justin O'Boyle and 5 more
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github-actions commentedon Feb 6, 2026
This issue might be a duplicate of existing issues. Please check:
Feel free to ignore if none of these address your specific case.
ItsWendell commentedon Feb 16, 2026
Here's a workaround that worked for me: #12338 (comment)
alexyaroshuk commentedon Feb 17, 2026
@tredondo i am not a maintainer, I can't close issues. If you want an issue closed, you may want to tag the issue's author or the assignee
DusKing1 commentedon Mar 7, 2026
If you're hitting the 200k limit on Anthropic direct API (not Bedrock), I published a plugin that fixes this. It needs both the plugin and model limit overrides in your
opencode.json:{ "plugin": ["opencode-anthropic-context-1m"], "provider": { "anthropic": { "models": { "claude-opus-4-6": { "limit": { "context": 1000000, "output": 128000 } }, "claude-sonnet-4-6": { "limit": { "context": 1000000, "output": 64000 } }, "claude-sonnet-4-5": { "limit": { "context": 1000000, "output": 64000 } }, "claude-sonnet-4-20250514": { "limit": { "context": 1000000, "output": 64000 } } } } } }The plugin injects the
context-1m-2025-08-07beta header, and the model overrides fix auto-compaction (168K → 968K).https://github.com/DusKing1/opencode-anthropic-context-1m