Skip to content

Enable routing to Vercel for Anthropic and OpenAI models #641

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
chrarnoldus wants to merge 3 commits into
base: main
Choose a base branch
from
Open

Enable routing to Vercel for Anthropic and OpenAI models #641

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
e9e594a
Enable routing to Vercel for Anthropic models
chrarnoldus Feb 27, 2026
708b0a7
Merge branch 'main' into christiaan/vercel
chrarnoldus Mar 2, 2026
9899a5a
Merge branch 'main' into christiaan/vercel
chrarnoldus Mar 3, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 3 additions & 3 deletions src/lib/providers/anthropic.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,9 @@ export function isHaikuModel(requestedModel: string) {
}

function appendAnthropicBetaHeader(extraHeaders: Record<string, string>, betaFlag: string) {
extraHeaders['x-anthropic-beta'] = [extraHeaders['x-anthropic-beta'], betaFlag]
.filter(Boolean)
.join(',');
for (const header of ['anthropic-beta', 'x-anthropic-beta']) {
extraHeaders[header] = [extraHeaders[header], betaFlag].filter(Boolean).join(',');
}
}

function hasCacheControl(message: OpenAI.ChatCompletionMessageParam) {
Expand Down
23 changes: 0 additions & 23 deletions src/lib/providers/vercel/index.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,8 +1,6 @@
import type { BYOKResult } from '@/lib/byok';
import { kiloFreeModels, preferredModels } from '@/lib/models';
import { isAnthropicModel } from '@/lib/providers/anthropic';
import { getGatewayErrorRate } from '@/lib/providers/gateway-error-rate';
import { isOpenAiModel } from '@/lib/providers/openai';
import type { VercelUserByokInferenceProviderId } from '@/lib/providers/openrouter/inference-provider-id';
import {
AutocompleteUserByokProviderIdSchema,
Expand Down Expand Up @@ -73,19 +71,6 @@ export async function shouldRouteToVercel(
return true;
}

if (isAnthropicModel(requestedModel)) {
console.debug(
`[shouldRouteToVercel] Anthropic models are not routed to Vercel pending fine-grained tool streaming support`
);
return false;
}

if (isOpenAiModel(requestedModel)) {
// 2026-03-03 Vercel returns this error: The model `gpt-5.3-codex-api-preview` does not exist or you do not have access to it.
console.debug(`[shouldRouteToVercel] OpenAI models are not routed to Vercel`);
return false;
}

if (!preferredModels.includes(requestedModel)) {
console.debug(`[shouldRouteToVercel] only recommended models are tested for Vercel routing`);
return false;
Expand Down Expand Up @@ -151,14 +136,6 @@ export function applyVercelSettings(
) {
requestToMutate.model = mapModelIdToVercel(requestedModel);

if (isAnthropicModel(requestedModel)) {
// https://vercel.com/docs/ai-gateway/model-variants#anthropic-claude-sonnet-4:-1m-token-context-beta
extraHeaders['anthropic-beta'] = [extraHeaders['x-anthropic-beta'], 'context-1m-2025-08-07']
.filter(Boolean)
.join(',');
delete extraHeaders['x-anthropic-beta'];
}

if (userByok) {
if (userByok.length === 0) {
throw new Error('Invalid state: userByok should be null or not empty');
Expand Down