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fix(claude-to-openai): strip Anthropic billing header from system prompt

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Remove dynamic x-anthropic-billing-header lines from Claude system prompts
when translating to OpenAI format to keep prompt prefixes stable and improve
prompt cache hits.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
weimaozhen
2026-06-13 10:05:12 +07:00
committed by decolua
parent bbc204b601
commit 0aaa5ab3c2
1 changed files with 7 additions and 3 deletions
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10
open-sse/translator/request/claude-to-openai.js
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@@ -2,6 +2,11 @@ import { register } from "../index.js";
import { FORMATS } from "../formats.js";
import { adjustMaxTokens } from "../helpers/maxTokensHelper.js";
function stripAnthropicBillingHeader(text) {
if (typeof text !== "string") return "";
return text.replace(/^x-anthropic-billing-header:[^\n]*(?:\r?\n)?/i, "");
}
// Convert Claude request to OpenAI format
export function claudeToOpenAIRequest(model, body, stream) {
const result = {
@@ -23,8 +28,8 @@ export function claudeToOpenAIRequest(model, body, stream) {
// System message
if (body.system) {
const systemContent = Array.isArray(body.system)
? body.system.map(s => s.text || "").join("\n")
: body.system;
? body.system.map(s => stripAnthropicBillingHeader(s.text || "")).filter(Boolean).join("\n")
: stripAnthropicBillingHeader(body.system);
if (systemContent) {
result.messages.push({
@@ -229,4 +234,3 @@ function convertToolChoice(choice) {
// Register
register(FORMATS.CLAUDE, FORMATS.OPENAI, claudeToOpenAIRequest, null);