ee7a961633
With the 1M-context beta enabled, Claude Code sends model: "claude-opus-5[1m]".
The marker is a client-side annotation — it matches no combo name, no alias and
no provider/model pair — so the request dies at model resolution with
"Invalid model format" and the client reports "There's an issue with the
selected model". Every request from that session fails until the beta is
switched off.
New open-sse/utils/modelMarkers.js exporting stripModelContextMarker(modelStr)
-> { model, contextMarker }. handleChat strips the marker before resolution and
normalizes body.model so downstream logging and translation see the real name.
Only a trailing marker is stripped, so a model whose name genuinely contains
brackets is left alone.
The capability itself travels in anthropic-beta: context-1m-2025-08-07, which
the default executor already forwards untouched — only the routing key needed
cleaning.
Fixes #3690.
Tests: tests/unit/model-context-marker.test.js (6 cases).
21 lines
1.1 KiB
JavaScript
21 lines
1.1 KiB
JavaScript
// Claude Code appends a bracketed context marker to the model name when the
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// 1M-context beta is toggled on: `claude-opus-5` becomes `claude-opus-5[1m]`.
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// The marker is a client-side annotation, not part of any model id: it never
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// matches a combo name, an alias or a `provider/model` pair, so a request that
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// carries it dies at model resolution with "Invalid model format".
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//
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// The capability itself travels in the `anthropic-beta: context-1m-2025-08-07`
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// header, which is forwarded untouched — stripping the marker is enough to let
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// the request route normally and still reach the upstream as a 1M request.
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const CONTEXT_MARKER = /\[1m\]$/i;
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// Returns { model, contextMarker } — contextMarker is null when there is none.
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export function stripModelContextMarker(modelStr) {
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if (typeof modelStr !== "string") return { model: modelStr, contextMarker: null };
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const trimmed = modelStr.trim();
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const match = trimmed.match(CONTEXT_MARKER);
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if (!match) return { model: modelStr, contextMarker: null };
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return { model: trimmed.slice(0, -match[0].length), contextMarker: match[0].slice(1, -1).toLowerCase() };
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}
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