Add Claude Opus 4.8 support

Register the model in the default Anthropic list, extend the v2
variant regex so it inherits the same adaptive-thinking presets
as opus-4-7, allowlist it for built-in web-search, and document
the v2 variants tier.

🤖 Generated with [eca](https://eca.dev)

Co-Authored-By: eca-agent <git@eca.dev>

Author: ericdallo

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - `bg_job` now shows the job name (from `shell_command`'s `background` arg) in `list`, `read_output` and `kill` outputs, e.g. `Background job "dev-server" (job-1) killed.`.
+- Add Claude Opus 4.8 support.
 
 ## 0.135.3
 

docs/config/variants.md

@@ -23,6 +23,19 @@ ECA ships with built-in variants for some known models via the `variantsByModel`
     | `high`     | `{"output_config": {"effort": "high"}, "thinking": {"type": "adaptive"}}` |
     | `max`      | `{"output_config": {"effort": "max"}, "thinking": {"type": "adaptive"}}` |
 
+=== "Anthropic (opus 4.7+)"
+
+    Applies to models matching `opus-4-7`, `opus-4-8` (any separator: `-`, `.`, `_`).
+
+    | Variant    | Payload |
+    | ---------- | ------- |
+    | `default`  | `{"thinking": {"type": "adaptive", "display": "summarized"}}` |
+    | `low`      | `{"output_config": {"effort": "low"}, "thinking": {"type": "adaptive", "display": "summarized"}}` |
+    | `medium`   | `{"output_config": {"effort": "medium"}, "thinking": {"type": "adaptive", "display": "summarized"}}` |
+    | `high`     | `{"output_config": {"effort": "high"}, "thinking": {"type": "adaptive", "display": "summarized"}}` |
+    | `xhigh`    | `{"output_config": {"effort": "xhigh"}, "thinking": {"type": "adaptive", "display": "summarized"}}` |
+    | `max`      | `{"output_config": {"effort": "max"}, "thinking": {"type": "adaptive", "display": "summarized"}}` |
+
 === "OpenAI"
 
     Applies to models matching `gpt-5-3-codex`, `gpt-5-2`. Excluded for `github-copilot` provider.

src/eca/config.clj

@@ -93,7 +93,8 @@
                             :requiresAuth? true
                             :models {"claude-sonnet-4-6" {}
                                      "claude-opus-4-6" {}
-                                     "claude-opus-4-7" {}}}
+                                     "claude-opus-4-7" {}
+                                     "claude-opus-4-8" {}}}
                "github-copilot" {:api "openai-chat"
                                  :url "${env:GITHUB_COPILOT_API_URL:https://api.githubcopilot.com}"
                                  :key nil ;; not supported, requires login auth
@@ -191,7 +192,7 @@
               :shellCommand {:summaryMaxLength 35}
               :outputTruncation {:lines 2000 :sizeKb 50}}
    :variantsByModel {".*sonnet[-._]4[-._]6|opus[-._]4[-._][56]" {:variants anthropic-variants}
-                     ".*opus[-._]4[-._]7" {:variants anthropic-v2-variants}
+                     ".*opus[-._]4[-._][78]" {:variants anthropic-v2-variants}
                      ".*gpt[-._]5(?:[-._](?:2|4|5)(?!\\d)|[-._]3[-._]codex)" {:variants openai-variants
                                                                               :excludeProviders ["github-copilot"]}
                      ".*deepseek[-._]v4[-._]pro" {:variants deepseek-variants

src/eca/models.clj

@@ -128,6 +128,8 @@
     "anthropic/claude-opus-4-5-20251101"
     "anthropic/claude-opus-4.7"
     "anthropic/claude-opus-4-7"
+    "anthropic/claude-opus-4.8"
+    "anthropic/claude-opus-4-8"
     "anthropic/claude-haiku-4-5-20251001"})
 
 (defn ^:private all