feat: enable 128k output beta feature for Anthropic API calls

Author: codestory

llm_client/src/clients/anthropic.rs

@@ -454,7 +454,7 @@ impl AnthropicClient {
             // enables prompt caching: https://arc.net/l/quote/qtlllqgf
             .header(
                 "anthropic-beta".to_owned(),
-                "prompt-caching-2024-07-31,max-tokens-3-5-sonnet-2024-07-15,computer-use-2024-10-22".to_owned(),
+                "prompt-caching-2024-07-31,max-tokens-3-5-sonnet-2024-07-15,computer-use-2024-10-22,output-128k-2025-02-19".to_owned(),
             )
             .json(&anthropic_request)
             .send()
@@ -727,7 +727,7 @@ impl LLMClient for AnthropicClient {
             // enables prompt caching: https://arc.net/l/quote/qtlllqgf
             .header(
                 "anthropic-beta".to_owned(),
-                "prompt-caching-2024-07-31,max-tokens-3-5-sonnet-2024-07-15,computer-use-2024-10-22".to_owned(),
+                "prompt-caching-2024-07-31,max-tokens-3-5-sonnet-2024-07-15,computer-use-2024-10-22,output-128k-2025-02-19".to_owned(),
             )
             .json(&anthropic_request)
             .send()
@@ -867,7 +867,7 @@ impl LLMClient for AnthropicClient {
             )
             .header(
                 "anthropic-beta".to_owned(),
-                "max-tokens-3-5-sonnet-2024-07-15".to_owned(),
+                "prompt-caching-2024-07-31,max-tokens-3-5-sonnet-2024-07-15,computer-use-2024-10-22,output-128k-2025-02-19".to_owned(),
             )
             .header("anthropic-version".to_owned(), "2023-06-01".to_owned())
             .header("content-type".to_owned(), "application/json".to_owned())