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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 16 Oct 2026
One change · api

mid-conversation-system-messages changedbuild-with-claude/mid-conversation-system-messages

Nearest release: v2.1.302, published 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.

Recorded here
Lines+5added
Lines−3removed
From line 2,210 where the diff opens
First seen 14 Aug 2026 this site's first read of the page
Recorded edits24to this page, all time

The whole hunk

from line 2210, old and new numbered
/
lines
from line 2210
22102210 ```csharp C#
22112211 using Anthropic.Models.Beta;
22122212 using Anthropic.Models.Beta.Messages;
2213 using Messages = Anthropic.Models.Messages;
22132214 
22142215 AnthropicClient client = new();
22152216 
22162217 var response = await client.Beta.Messages.Create(new MessageCreateParams
22172218 {
2218 Model = "claude-fable-5-1",
2219 Model = Messages::Model.ClaudeFable5_1,
22192220 MaxTokens = 4096,
22202221 Messages =
22212222 [
from line 2245
22442245 client := anthropic.NewClient()
22452246 
22462247 response, err := client.Beta.Messages.New(context.Background(), anthropic.BetaMessageNewParams{
2247 Model: "claude-fable-5-1",
2248 Model: anthropic.ModelClaudeFable5_1,
22482249 MaxTokens: 4096,
22492250 Messages: []anthropic.BetaMessageParam{
22502251 anthropic.NewBetaUserMessage(anthropic.NewBetaTextBlock("Draft a short status update on the database migration for the team channel.")),
from line 2274
22732274 import com.anthropic.models.beta.messages.BetaMessage;
22742275 import com.anthropic.models.beta.messages.BetaMessageParam;
22752276 import com.anthropic.models.beta.messages.MessageCreateParams;
2277 import com.anthropic.models.messages.Model;
22762278 
22772279 void main() {
22782280 AnthropicClient client = AnthropicOkHttpClient.fromEnv();
22792281 
22802282 MessageCreateParams params = MessageCreateParams.builder()
2281 .model("claude-fable-5-1")
2283 .model(Model.CLAUDE_FABLE_5_1)
22822284 .maxTokens(4096L)
22832285 .addBeta(AnthropicBeta.MID_CONVERSATION_SYSTEM_CLEAR_AT_2026_08_21)
22842286 .addUserMessage("Draft a short status update on the database migration for the team channel.")
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