docs: clarify ChatGPT/Claude subscriptions aren't supported

src/content/docs/agent-platform/getting-started/faqs.mdx

@@ -31,6 +31,17 @@ Warp supports a curated list of LLMs from providers like OpenAI, Anthropic, and
 
 Warp supports [Bring Your Own Key (BYOK)](/agent-platform/inference/bring-your-own-api-key/) for users on paid plans (starting with Build). You can connect your own Anthropic, OpenAI, or Google API keys to route requests directly through your account. Organizations on the Enterprise plan can additionally enable managed "Bring Your Own LLM" configurations to meet strict security or compliance requirements.
 
+### Can I use my ChatGPT or Claude subscription with Warp?
+
+No. Warp doesn't support signing in with a ChatGPT (OpenAI) or Claude (Anthropic) consumer subscription to power its agents. OpenAI and Anthropic don't currently allow their subscription plans to be used in third-party clients like Warp. Warp has raised this with both providers and is open to supporting these subscriptions if that changes.
+
+Note that a ChatGPT or Claude subscription is different from API access. To use your own OpenAI or Anthropic account in Warp, you have two options:
+
+* **[Bring Your Own API Key (BYOK)](/agent-platform/inference/bring-your-own-api-key/)** — Add your own OpenAI, Anthropic, or Google API key and pay your provider directly instead of using Warp credits.
+* **[Custom inference endpoint](/agent-platform/inference/custom-inference-endpoint/)** — Route Warp through any OpenAI-compatible endpoint, such as OpenRouter or LiteLLM.
+
+For xAI's Grok models, you can connect a [SuperGrok subscription](/agent-platform/inference/grok-subscription/) directly through your xAI account.
+
 ## Billing
 
 Every Warp plan includes a set number of credits per user per month. See [pricing](https://www.warp.dev/pricing) to compare plans.

src/content/docs/agent-platform/inference/bring-your-own-api-key.mdx

@@ -30,6 +30,10 @@ See [Warp pricing](https://www.warp.dev/pricing) for current plan availability.
 
 Platform credits apply to every cloud agent run on any plan, and to local agent runs on Business and Enterprise when using BYOK, a custom inference endpoint, or BYOLLM. See [platform credits](/support-and-community/plans-and-billing/platform-credits/) for the full breakdown.
 
+:::note
+**Can I sign in with a ChatGPT or Claude subscription?** No. A ChatGPT (OpenAI) or Claude (Anthropic) consumer subscription can't be connected to Warp the way a [SuperGrok subscription](/agent-platform/inference/grok-subscription/) can. OpenAI and Anthropic don't currently allow their subscription plans to be used in third-party clients like Warp. To use your own OpenAI or Anthropic account, add an API key with BYOK and pay your provider directly. A subscription and API access are billed separately by the provider.
+:::
+
 ## How BYOK works
 
 When you add your own model API keys in Warp, those keys are stored **only on your device** (in your OS keychain or equivalent secure storage), never on Warp's servers. They're used to make requests to your chosen model provider.