One change

beta-headers

api/beta-headers

20 Aug 2026 17:07 UTC first seen 14 Aug 2026 The page's own history The capture it came from

Nearest release: v2.1.238, published under an hour after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

api/beta-headers Changed · +10 / -10 lines

from line 24

 
 Each feature's documentation states the exact beta name to send. The [API overview](https://platform.claude.com/docs/en/api/overview) lists the APIs currently in beta.
 
-The following examples show the same request with cURL, the `ant` CLI, and the SDKs. The SDKs take beta names in the `betas` parameter and send the `anthropic-beta` header for you:
+The following examples show the same request with cURL, the `ant` CLI, and the SDKs, using the [context editing](https://platform.claude.com/docs/en/build-with-claude/context-editing) beta as the example. The SDKs take beta names in the `betas` parameter and send the `anthropic-beta` header for you:
 
 <CodeGroup>
   ```bash cURL

from line 31

   curl https://api.anthropic.com/v1/messages \
     -H "x-api-key: $ANTHROPIC_API_KEY" \
     -H "anthropic-version: 2023-06-01" \
-    -H "anthropic-beta: files-api-2025-04-14" \
+    -H "anthropic-beta: context-management-2025-06-27" \
     -H "content-type: application/json" \
     -d '{
       "model": "claude-opus-5",

from line 44

 
   ```bash CLI
   ant beta:messages create \
-    --beta files-api-2025-04-14 \
+    --beta context-management-2025-06-27 \
     --model claude-opus-5 \
     --max-tokens 1024 \
     --message '{role: user, content: "Hello, Claude"}'

from line 57

       model="claude-opus-5",
       max_tokens=1024,
       messages=[{"role": "user", "content": "Hello, Claude"}],
-      betas=["files-api-2025-04-14"],
+      betas=["context-management-2025-06-27"],
   )
 
   print(response.content)

from line 70

     model: "claude-opus-5",
     max_tokens: 1024,
     messages: [{ role: "user", content: "Hello, Claude" }],
-    betas: ["files-api-2025-04-14"]
+    betas: ["context-management-2025-06-27"]
   });
 
   console.log(msg.content);

from line 85

           Model = "claude-opus-5",
           MaxTokens = 1024,
           Messages = [new() { Role = Role.User, Content = "Hello, Claude" }],
-          Betas = ["files-api-2025-04-14"],
+          Betas = ["context-management-2025-06-27"],
       }
   );

from line 101

   	Messages: []anthropic.BetaMessageParam{
   		anthropic.NewBetaUserMessage(anthropic.NewBetaTextBlock("Hello, Claude")),
   	},
-  	Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
+  	Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaContextManagement2025_06_27},
   })
   if err != nil {
   	panic(err)

from line 117

     .model(Model.CLAUDE_OPUS_5)
     .maxTokens(1024)
     .addUserMessage("Hello, Claude")
-    .addBeta(AnthropicBeta.FILES_API_2025_04_14)
+    .addBeta(AnthropicBeta.CONTEXT_MANAGEMENT_2025_06_27)
     .build();
 
   BetaMessage message = client.beta().messages().create(params);

from line 131

       maxTokens: 1024,
       messages: [['role' => 'user', 'content' => 'Hello, Claude']],
       model: 'claude-opus-5',
-      betas: ['files-api-2025-04-14'],
+      betas: ['context-management-2025-06-27'],
   );
 
   echo $message;

from line 144

     model: "claude-opus-5",
     max_tokens: 1024,
     messages: [{role: "user", content: "Hello, Claude"}],
-    betas: ["files-api-2025-04-14"]
+    betas: ["context-management-2025-06-27"]
   )
 
   puts(message.content)