Use claude-sonnet-4-6 in 59, 60 and 60a, and keep extended thinking

Reverts the previous commit's removal of thinking_budget_tokens and picks
a model that accepts it instead.

These three set thinking_budget_tokens, which the SDK serializes as
{"enabled": true, "budgetTokens": N}. Claude 4.7+ models reject that
shape, and the SDK has no way to emit the adaptive form the API asks for:
reasoning_effort is set on the agent config but never reaches the
LLM_CHAT_COMPLETE task, so it is silently dropped rather than acting as a
substitute. Dropping thinking to stay on claude-sonnet-5 therefore traded
away a demonstrated feature for no gain.

claude-sonnet-4-6 accepts thinking_budget_tokens and still fixes the 404
from the retired id, which is what #480 is about. It is also registered
on more deployments: 59_coding_agent.py now passes against both Conductor
OSS 3.32.0 (302s) and Orkes 5.5.0 (301s), where under claude-sonnet-5 the
Orkes leg failed outright.

The rule this leaves: examples that set thinking_budget_tokens pin
claude-sonnet-4-6; everything else stays on claude-sonnet-5, matching
#494. 60 and 60a were not run, as both act on a real GitHub repository.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: ambiorix2099

examples/agents/59_coding_agent.py

@@ -5,6 +5,7 @@
     - Coder writes code, transfers to QA when ready
     - QA tester reviews and runs tests, transfers back if bugs found
     - Natural back-and-forth until QA approves the code
+    - Extended thinking for step-by-step reasoning
 
 Flow (swarm — LLM-driven handoffs):
     1. coder writes the solution, executes it, transfers to qa_tester
@@ -25,7 +26,7 @@
 
 qa_tester = Agent(
     name="qa_tester",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a meticulous QA engineer. Review the code written by the "
         "coder for correctness, edge cases, and bugs. Write and execute test "
@@ -36,14 +37,15 @@
         "provide your final QA report. Do NOT transfer back if all tests pass."
     ),
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── Coder: writes code, hands off to QA for review ──────────────────
 
 coder = Agent(
     name="coder",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are an expert Python developer. Write clean, well-structured "
         "Python code to solve the given problem. Always execute your code to "
@@ -54,6 +56,7 @@
         "to qa_tester for verification."
     ),
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
     # Swarm: coder starts, can hand off to qa_tester and back
     agents=[qa_tester],

examples/agents/60_github_coding_agent.py

@@ -249,7 +249,7 @@ def create_pull_request(title: str, body: str, issue_number: int = 0) -> str:
 
 github_agent = Agent(
     name="github_agent",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a GitHub operations specialist. You handle all git and "
         "GitHub CLI interactions.\n\n"
@@ -274,14 +274,15 @@ def create_pull_request(title: str, body: str, issue_number: int = 0) -> str:
         "transfer tool after this — the workflow ends automatically."
     ),
     tools=github_tools,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── Coder: implements the fix ────────────────────────────────────────
 
 coder = Agent(
     name="coder",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are an expert developer. Write clean, well-structured code.\n\n"
         "WHEN YOU RECEIVE A TASK:\n"
@@ -302,14 +303,15 @@ def create_pull_request(title: str, body: str, issue_number: int = 0) -> str:
     ),
     tools=coding_tools,
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── QA Tester: reviews code and runs tests ───────────────────────────
 
 qa_tester = Agent(
     name="qa_tester",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a meticulous QA engineer. Review the code written by the "
         "coder for correctness, edge cases, and bugs.\n\n"
@@ -330,14 +332,15 @@ def create_pull_request(title: str, body: str, issue_number: int = 0) -> str:
     ),
     tools=qa_tools,
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── Coding Team: swarm coordinator ───────────────────────────────────
 
 coding_team = Agent(
     name="coding_team",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a coding team coordinator. Delegate the incoming request "
         "to github_agent to get started — it will pick an issue and set "

examples/agents/60a_github_coding_agent_simple.py

@@ -41,7 +41,7 @@
 
 github_agent = Agent(
     name="github_agent",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a GitHub operations specialist. You handle all git and "
         "GitHub CLI interactions.\n\n"
@@ -69,14 +69,15 @@
         "transfer tool — the workflow ends automatically."
     ),
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── Coder: implements the fix ────────────────────────────────────────
 
 coder = Agent(
     name="coder",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are an expert developer. You write clean, well-structured code.\n\n"
         f"The repo is cloned at {WORK_DIR}.\n\n"
@@ -100,14 +101,15 @@
         "every code block runs in an isolated environment."
     ),
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── QA Tester: reviews code and runs tests ───────────────────────────
 
 qa_tester = Agent(
     name="qa_tester",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a meticulous QA engineer. Review the code written by the "
         "coder for correctness, edge cases, and bugs.\n\n"
@@ -124,14 +126,15 @@
         "  NEVER call transfer_to_coding_team (it will be rejected)\n"
     ),
     local_code_execution=True,
+    thinking_budget_tokens=4096,
     max_tokens=16384,
 )
 
 # ── Coding Team: swarm coordinator ───────────────────────────────────
 
 coding_team = Agent(
     name="coding_team",
-    model="anthropic/claude-sonnet-5",
+    model="anthropic/claude-sonnet-4-6",
     instructions=(
         "You are a coding team coordinator. Delegate the incoming request "
         "to github_agent to get started — it will pick an issue and set "