diff --git a/resources/models/builtin.toml b/resources/models/builtin.toml
index 02435c4f..d88a23bc 100644
--- a/resources/models/builtin.toml
+++ b/resources/models/builtin.toml
@@ -33,9 +33,16 @@ context_window = 256000
 # context window on this route, even when public API docs advertise larger
 # model-family windows.
 # Codex currently caps the ChatGPT-backed route at 272k even though the public
-# GPT-5.6 Sol API model advertises a 1.05M context window. Keep both values so
-# resolution and compaction use the effective backend limit without losing the
+# GPT-6 Astra and GPT-5.6 Sol advertise a 1.05M context window. Keep both values so
+# resolution and compaction use the effective backend limit without losing each
 # underlying model capability.
+[[model]]
+id = "gpt-6-astra"
+provider = "codex-oauth"
+context_window = 1050000
+max_context_window = 272000
+capability = { tool_calling = "parallel", structured_output = "json_schema", reasoning = "effort", vision = true, prompt_caching = { kind = "auto" } }
+
 [[model]]
 id = "gpt-5.6-sol"
 provider = "codex-oauth"