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feat: add Vercel AI Gateway provider (#1628)

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* feat: add Vercel AI Gateway as a first-class provider

Adds AI Gateway (ai-gateway.vercel.sh) as a new inference provider
with AI_GATEWAY_API_KEY authentication, live model discovery, and
reasoning support via extra_body.reasoning.

Based on PR #1492 by jerilynzheng.

* feat: add AI Gateway to setup wizard, doctor, and fallback providers

* test: add AI Gateway to api_key_providers test suite

* feat: add AI Gateway to hermes model CLI and model metadata

Wire AI Gateway into the interactive model selection menu and add
context lengths for AI Gateway model IDs in model_metadata.py.

* feat: use claude-haiku-4.5 as AI Gateway auxiliary model

* revert: use gemini-3-flash as AI Gateway auxiliary model

* fix: move AI Gateway below established providers in selection order

---------

Co-authored-by: jerilynzheng <jerilynzheng@users.noreply.github.com>
Co-authored-by: jerilynzheng <zheng.jerilyn@gmail.com>
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Teknium 2026-03-17 00:12:16 -07:00 • committed by GitHub
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16 changed files with 223 additions and 9 deletions
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34
tests/test_provider_parity.py
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@ -137,6 +137,40 @@ class TestBuildApiKwargsOpenRouter:
assert "codex_reasoning_items" in messages[1]
class TestBuildApiKwargsAIGateway:
def test_uses_chat_completions_format(self, monkeypatch):
agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1")
messages = [{"role": "user", "content": "hi"}]
kwargs = agent._build_api_kwargs(messages)
assert "messages" in kwargs
assert "model" in kwargs
assert kwargs["messages"][-1]["content"] == "hi"
def test_no_responses_api_fields(self, monkeypatch):
agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1")
messages = [{"role": "user", "content": "hi"}]
kwargs = agent._build_api_kwargs(messages)
assert "input" not in kwargs
assert "instructions" not in kwargs
assert "store" not in kwargs
def test_includes_reasoning_in_extra_body(self, monkeypatch):
agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1")
messages = [{"role": "user", "content": "hi"}]
kwargs = agent._build_api_kwargs(messages)
extra = kwargs.get("extra_body", {})
assert "reasoning" in extra
assert extra["reasoning"]["enabled"] is True
def test_includes_tools(self, monkeypatch):
agent = _make_agent(monkeypatch, "ai-gateway", base_url="https://ai-gateway.vercel.sh/v1")
messages = [{"role": "user", "content": "hi"}]
kwargs = agent._build_api_kwargs(messages)
assert "tools" in kwargs
tool_names = [t["function"]["name"] for t in kwargs["tools"]]
assert "web_search" in tool_names
class TestBuildApiKwargsNousPortal:
def test_includes_nous_product_tags(self, monkeypatch):
agent = _make_agent(monkeypatch, "nous", base_url="https://inference-api.nousresearch.com/v1")