From 0e2e8124cc1f07c0423e1970e3232f49417304c1 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 14 Apr 2026 03:52:07 +0000
Subject: [PATCH 1/4] Initial plan


From caf33deb8236ee9ef3fd09aacd939a4c99840d15 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 14 Apr 2026 03:53:09 +0000
Subject: [PATCH 2/4] feat: allow arbitrary reasoning_effort values for forward
 compatibility

Agent-Logs-Url: https://github.com/lyzgeorge/copilot-api/sessions/10f76b26-728d-41d8-8fb3-432974af4318

Co-authored-by: lyzgeorge <8285196+lyzgeorge@users.noreply.github.com>
---
 src/routes/reasoning-context.ts                 | 2 +-
 src/services/copilot/create-chat-completions.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/routes/reasoning-context.ts b/src/routes/reasoning-context.ts
index 03f851c31..7bef76e73 100644
--- a/src/routes/reasoning-context.ts
+++ b/src/routes/reasoning-context.ts
@@ -3,7 +3,7 @@ import type { ChatCompletionsPayload } from "~/services/copilot/create-chat-comp
 import type { Model } from "~/services/copilot/get-models"
 
 export interface ReasoningContext {
-  reasoningEffort?: "low" | "medium" | "high"
+  reasoningEffort?: "low" | "medium" | "high" | string
   thinkingBudget?: number
 }
 
diff --git a/src/services/copilot/create-chat-completions.ts b/src/services/copilot/create-chat-completions.ts
index 15f3e0a21..8da439c24 100644
--- a/src/services/copilot/create-chat-completions.ts
+++ b/src/services/copilot/create-chat-completions.ts
@@ -143,7 +143,7 @@ export interface ChatCompletionsPayload {
   logit_bias?: Record<string, number> | null
   logprobs?: boolean | null
   response_format?: { type: "json_object" } | null
-  reasoning_effort?: "low" | "medium" | "high" | null
+  reasoning_effort?: "low" | "medium" | "high" | (string & {}) | null
   seed?: number | null
   stream_options?: { include_usage?: boolean } | null
   thinking_budget?: number | null

From dcfb3690c60ac4c09832f8dec3ea1f60afafd947 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 14 Apr 2026 03:54:01 +0000
Subject: [PATCH 3/4] fix: use (string & {}) in ReasoningContext for consistent
 IDE autocomplete

Agent-Logs-Url: https://github.com/lyzgeorge/copilot-api/sessions/10f76b26-728d-41d8-8fb3-432974af4318

Co-authored-by: lyzgeorge <8285196+lyzgeorge@users.noreply.github.com>
---
 src/routes/reasoning-context.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/routes/reasoning-context.ts b/src/routes/reasoning-context.ts
index 7bef76e73..ee542e273 100644
--- a/src/routes/reasoning-context.ts
+++ b/src/routes/reasoning-context.ts
@@ -3,7 +3,7 @@ import type { ChatCompletionsPayload } from "~/services/copilot/create-chat-comp
 import type { Model } from "~/services/copilot/get-models"
 
 export interface ReasoningContext {
-  reasoningEffort?: "low" | "medium" | "high" | string
+  reasoningEffort?: "low" | "medium" | "high" | (string & {})
   thinkingBudget?: number
 }
 

From 4f0d9cafafd0b7306972beb801e3b8599c5c9c64 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 14 Apr 2026 03:57:16 +0000
Subject: [PATCH 4/4] docs: add fork improvements hook at top of README

Agent-Logs-Url: https://github.com/lyzgeorge/copilot-api/sessions/83622886-a808-4ba6-820c-75ed8300f3ab

Co-authored-by: lyzgeorge <8285196+lyzgeorge@users.noreply.github.com>
---
 README.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 92f0df518..b0b3a55aa 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,18 @@
 # Copilot API Proxy
 
+> **This is a fork of [ericc-ch/copilot-api](https://github.com/ericc-ch/copilot-api) with full reasoning / extended-thinking support added.**
+>
+> **What this fork adds:**
+>
+> - **Capability-aware reasoning routing** — reads each model's `capabilities.supports` at startup and routes `reasoning_effort` / `thinking_budget` only to models that actually support them; unsupported models silently strip the fields.
+> - **Anthropic ↔ OpenAI thinking translation** — `thinking: { type: "enabled", budget_tokens: N }` on the `/v1/messages` surface is automatically translated into `reasoning_effort: "high"` + `thinking_budget` for the upstream call, and vice versa.
+> - **Streaming thinking traces** — Claude thinking streams emit proper `content_block_start` / `thinking_delta` / `signature_delta` / `content_block_stop` events so Claude Code and similar clients see native thinking UIs.
+> - **Forward-compatible `reasoning_effort`** — type accepts any string (not just `"low" | "medium" | "high"`), so new model-specific values like `"xhigh"` or `"minimal"` are transparently passed through without code changes.
+>
+> Everything else — auth, rate limiting, usage dashboard, CLI flags — is identical to the upstream project.
+
+---
+
 **One Copilot subscription. Every frontier reasoning model. OpenAI and Anthropic shaped.** Point Claude Code, Cline, or your own scripts at a single localhost URL and unlock Claude Sonnet 4.6, GPT-5, Gemini, and friends — with real reasoning traces and thinking budgets routed to whichever knob the upstream model actually supports.
 
 > [!WARNING]