fix(executors): granular reasoning_effort handling for Claude models on Copilot

OmniRoute's GitHub Copilot sanitizer stripped reasoning_effort for every
Claude model (regex /(claude|haiku|oswe)/i), so Claude Opus 4.6 and
Sonnet 4.6 via Copilot never received extended-thinking configuration
even though their backend honors it (3× token increase between
low/medium/high, verified upstream).

Add a granular opt-in for Copilot's Claude routing:
  - Pass through reasoning_effort for Claude Opus 4.6 / Sonnet 4.6
  - Still strip for Haiku 4.5 / Opus 4.7 (rejected upstream), older
    Sonnet/Opus variants, and the oswe-* family

Order matters: the opt-in match runs BEFORE the broad strip pattern.

Notes:
- OmniRoute's openai→claude translator already maps reasoning_effort →
  thinking.budget_tokens far more richly than upstream's tiny mapping
  table (handles max, xhigh, adaptive models, fits to max_tokens via
  fitThinkingToMaxTokens), so only the github-executor half of upstream
  PR #791 is ported here.
- "none" is intentionally NOT stripped universally: GPT-5.x treats
  reasoning_effort=none as a real value (the non-reasoning mode that
  unlocks sampling params, see gpt5SamplingGuard.ts) — stripping it
  would break GPT-5 callers.

Co-authored-by: Manuel <baslr@users.noreply.github.com>
Inspired-by: https://github.com/decolua/9router/pull/791

CHANGELOG.md

@@ -18,6 +18,7 @@ _In development — bullets added per PR; finalized at release._
 - **fix(translator):** sanitize Read tool args from non-Anthropic models to prevent retry loops. (thanks @GodrezJr2)
 - **fix(usage):** reuse Gemini CLI project ID for quota checks (avoid re-discovery). (thanks @Delcado19)
 - **fix(dashboard):** surface manual config CTA when Claude CLI detection fails (remote deployments). (thanks @anuragg-saxenaa)
+- **fix(executors):** granular reasoning_effort handling for Claude models on GitHub Copilot. (thanks @baslr)
 - **fix(combo): round-robin members fail over faster under concurrency saturation via a configurable queue depth** — when a round-robin combo member was saturated, requests sat in the per-model semaphore's **unbounded** queue and only failed over to the next member after the full `queueTimeoutMs` (default 30s) elapsed — so a burst of agentic requests deep-queued one hot member instead of spilling to healthy ones. The per-model semaphore now accepts a bounded queue depth and emits `SEMAPHORE_QUEUE_FULL` once it is full (the round-robin loop already cascades on that code), so a configured low depth fails over immediately. A new `queueDepth` combo-config knob (global default / provider override / per-combo, default **20** for backward compatibility; **0** = never queue → fail over now) is exposed in Settings → Combo Defaults. ([#3872](https://github.com/diegosouzapw/OmniRoute/issues/3872) — thanks @KooshaPari)
 - **fix(pricing): align Claude Code (`cc`) pricing with current Anthropic per-MTok rates** — the `cc` provider block in the default pricing table had stale numbers across every Claude 4.x family entry — most visibly, `claude-opus-4-5-20251101` was billed at the deprecated Opus 4.1 rate (`input $15` / `output $75`), and `claude-haiku-4-5-20251001` was at half the current Haiku 4.5 rate. The `cached` (cache hit) and `cache_creation` (5-minute cache write) multipliers were also off across Opus 4.6/4.7/4.8, Sonnet 4.5/4.6, Haiku 4.5, and Fable 5. All eight entries now match the rates Anthropic publishes (input, 5m cache write at 1.25x input, cache hit at 0.1x input, output; reasoning billed at the output rate), so cost accounting on the dashboard and per-request usage events stop under- or over-reporting Claude Code spend. (thanks @chulanpro5)
 

open-sse/executors/base.ts

@@ -242,6 +242,18 @@ function hasActiveClaudeThinking(body: Record<string, unknown>): boolean {
  * xhigh by default and falls back to high only for explicit xhigh opt-outs.
  */
 const MISTRAL_NO_REASONING_EFFORT_PATTERN = /devstral/i;
+// GitHub Copilot Claude routing is granular (upstream port: decolua/9router#791):
+//   ✅ Pass through — Claude Opus 4.6, Claude Sonnet 4.6. Copilot routes both to
+//      Anthropic's chat/completions surface, which honors reasoning_effort and
+//      emits visible reasoning tokens (verified upstream: 3× token increase
+//      between low/medium/high).
+//   ❌ Strip — Claude Haiku 4.5 and Claude Opus 4.7 (rejected upstream by
+//      Copilot's Claude backend), older Claude variants, all `haiku`-named
+//      models, and the `oswe-*` family (Raptor) which still rejects
+//      reasoning_effort.
+// Order matters: the opt-in check must run BEFORE the broad Claude/haiku/oswe strip.
+const GITHUB_REASONING_EFFORT_OPT_IN_PATTERN =
+  /claude[-_.]?(?:opus|sonnet)[-_.]?4[-_.]6/i;
 const GITHUB_NO_REASONING_EFFORT_PATTERN = /(claude|haiku|oswe)/i;
 
 function supportsMaxEffortForProvider(provider: string, model: string): boolean {
@@ -269,9 +281,11 @@ export function sanitizeReasoningEffortForProvider(
   const effortStr = typeof effort === "string" ? effort.toLowerCase() : "";
   const modelStr = model || "";
 
+  const githubOptIn =
+    provider === "github" && GITHUB_REASONING_EFFORT_OPT_IN_PATTERN.test(modelStr);
   const rejecting =
     (provider === "mistral" && MISTRAL_NO_REASONING_EFFORT_PATTERN.test(modelStr)) ||
-    (provider === "github" && GITHUB_NO_REASONING_EFFORT_PATTERN.test(modelStr));
+    (provider === "github" && !githubOptIn && GITHUB_NO_REASONING_EFFORT_PATTERN.test(modelStr));
   if (rejecting) {
     log?.info?.(
       "REASONING_SANITIZE",

tests/unit/base-executor-sanitize-effort.test.ts

@@ -250,13 +250,25 @@ test("sanitizeReasoningEffortForProvider: mistral/devstral strips reasoning_effo
   );
 });
 
-test("sanitizeReasoningEffortForProvider: github/claude-opus strips reasoning_effort entirely", () => {
+test("sanitizeReasoningEffortForProvider: github/claude-opus-4.6 preserves reasoning_effort (#791)", () => {
+  // Upstream PR decolua/9router#791 (port): Copilot now honors reasoning_effort
+  // on Claude Opus 4.6 and Sonnet 4.6. Older Opus variants and Haiku still strip.
   const body = {
     model: "claude-opus-4-6",
     reasoning_effort: "high",
     messages: [],
   };
   const result = sanitizeReasoningEffortForProvider(body, "github", "claude-opus-4-6", null);
+  assert.equal((result as any).reasoning_effort, "high");
+});
+
+test("sanitizeReasoningEffortForProvider: github/claude-opus-4.7 still strips (#791)", () => {
+  const body = {
+    model: "claude-opus-4.7",
+    reasoning_effort: "high",
+    messages: [],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-opus-4.7", null);
   assert.equal((result as any).reasoning_effort, undefined);
 });
 
@@ -274,6 +286,10 @@ test("sanitizeReasoningEffortForProvider: rejecting providers strip max before n
   );
   assert.equal((mistralResult as any).reasoning_effort, undefined);
 
+  // Pre-#791: github stripped reasoning_effort entirely for every Claude model.
+  // Post-#791: Opus 4.6 keeps reasoning_effort; `max` downgrades to `high`
+  // because github is not Claude/CC-compatible (so supportsMax=false) and
+  // the canonical Claude Opus 4.6 model opts out of xhigh.
   const githubBody = {
     model: "claude-opus-4-6",
     reasoning_effort: "max",
@@ -285,7 +301,22 @@ test("sanitizeReasoningEffortForProvider: rejecting providers strip max before n
     "claude-opus-4-6",
     null
   );
-  assert.equal((githubResult as any).reasoning_effort, undefined);
+  assert.equal((githubResult as any).reasoning_effort, "high");
+
+  // Pre-#791 strip is preserved for github Claude models that DO NOT opt in
+  // (Haiku 4.5, Opus 4.7, older Sonnet, etc.).
+  const githubHaiku = {
+    model: "claude-haiku-4.5",
+    reasoning_effort: "max",
+    messages: [],
+  };
+  const githubHaikuResult = sanitizeReasoningEffortForProvider(
+    githubHaiku,
+    "github",
+    "claude-haiku-4.5",
+    null
+  );
+  assert.equal((githubHaikuResult as any).reasoning_effort, undefined);
 });
 
 test("sanitizeReasoningEffortForProvider: mistral/devstral strips reasoning object when only effort present", () => {

tests/unit/github-claude-reasoning-effort-granular.test.ts

@@ -0,0 +1,116 @@
+// Regression tests for granular reasoning_effort handling on GitHub Copilot
+// Claude models (upstream port: decolua/9router#791 by @baslr).
+//
+// Pre-port behaviour: the github branch of sanitizeReasoningEffortForProvider
+// stripped reasoning_effort for ANY model whose name matched /(claude|haiku|oswe)/i,
+// so Claude Opus 4.6 and Claude Sonnet 4.6 via GitHub Copilot never received
+// extended-thinking configuration even though both backends support it.
+//
+// Post-port behaviour: reasoning_effort is preserved on Claude Opus 4.6 and
+// Claude Sonnet 4.6 (Copilot routes both to Anthropic's chat/completions
+// surface where reasoning_effort is honored), and continues to be stripped on
+// Claude Haiku 4.5 and Claude Opus 4.7 (rejected upstream).
+//
+// Note: OmniRoute's openai→claude translator already maps reasoning_effort →
+// thinking.budget_tokens far more richly than upstream's tiny effortToBudget
+// table (handles `max`, `xhigh`, adaptive models, and fits to max_tokens), so
+// only the github-executor half of upstream PR #791 needs porting.
+
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const { sanitizeReasoningEffortForProvider } = await import("../../open-sse/executors/base.ts");
+
+test("github/claude-opus-4.6: preserves reasoning_effort (#791)", () => {
+  const body = {
+    model: "claude-opus-4.6",
+    reasoning_effort: "high",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-opus-4.6", null);
+  assert.equal((result as any).reasoning_effort, "high", "Opus 4.6 must keep reasoning_effort");
+});
+
+test("github/claude-sonnet-4.6: preserves reasoning_effort (#791)", () => {
+  const body = {
+    model: "claude-sonnet-4.6",
+    reasoning_effort: "medium",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-sonnet-4.6", null);
+  assert.equal((result as any).reasoning_effort, "medium", "Sonnet 4.6 must keep reasoning_effort");
+});
+
+test("github/claude-haiku-4.5: still strips reasoning_effort (#791)", () => {
+  const body = {
+    model: "claude-haiku-4.5",
+    reasoning_effort: "high",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-haiku-4.5", null);
+  assert.equal(
+    (result as any).reasoning_effort,
+    undefined,
+    "Haiku 4.5 rejects reasoning_effort upstream — must strip"
+  );
+});
+
+test("github/claude-opus-4.7: still strips reasoning_effort (#791)", () => {
+  const body = {
+    model: "claude-opus-4.7",
+    reasoning_effort: "high",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-opus-4.7", null);
+  assert.equal(
+    (result as any).reasoning_effort,
+    undefined,
+    "Opus 4.7 rejects reasoning_effort upstream — must strip"
+  );
+});
+
+test("github/claude-opus-4.6: preserves nested reasoning.effort (#791)", () => {
+  const body = {
+    model: "claude-opus-4.6",
+    reasoning: { effort: "high", summary: "auto" },
+    input: [],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-opus-4.6", null);
+  assert.equal((result as any).reasoning.effort, "high");
+  assert.equal((result as any).reasoning.summary, "auto", "other reasoning fields preserved");
+});
+
+test("github/claude-sonnet-4.5: still strips reasoning_effort (older Sonnet)", () => {
+  // Upstream PR #791 explicitly opts in only Opus 4.6 and Sonnet 4.6. Older
+  // Sonnet variants (4.5) keep the historical strip — Copilot has not made
+  // reasoning_effort available for them.
+  const body = {
+    model: "claude-sonnet-4.5",
+    reasoning_effort: "high",
+    messages: [{ role: "user", content: "hi" }],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "claude-sonnet-4.5", null);
+  assert.equal((result as any).reasoning_effort, undefined);
+});
+
+test("github/oswe-vscode-prime: still strips reasoning_effort", () => {
+  // Regression guard: the oswe branch of the rejection pattern must remain.
+  const body = {
+    model: "oswe-vscode-prime",
+    reasoning_effort: "high",
+    messages: [],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "oswe-vscode-prime", null);
+  assert.equal((result as any).reasoning_effort, undefined);
+});
+
+test("github/gpt-5.4: pass-through (non-Claude unchanged)", () => {
+  // Regression guard: non-Claude github models keep reasoning_effort.
+  const body = {
+    model: "gpt-5.4",
+    reasoning_effort: "high",
+    messages: [],
+  };
+  const result = sanitizeReasoningEffortForProvider(body, "github", "gpt-5.4", null);
+  assert.equal((result as any).reasoning_effort, "high");
+});