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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 16 Oct 2026
One change · api

migration-guide changedmodels/opus-5-5/migration-guide

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+6added
Lines−6removed
From line 1,283 where the diff opens
First seen 23 Sep 2026 this site's first read of the page
Recorded edits20to this page, all time

The whole hunk

from line 1283, old and new numbered
/
lines
from line 1283
12831283 
12841284 var parameters = new MessageCreateParams
12851285 {
1286 Model = "claude-opus-4-6",
1286 Model = Model.ClaudeOpus4_6,
12871287 MaxTokens = 16000,
12881288 Thinking = new ThinkingConfigEnabled(budgetTokens: 10000),
12891289 Messages = [new() { Role = Role.User, Content = "..." }]
from line 1297
12971297 client := anthropic.NewClient()
12981298 
12991299 response, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
1300 Model: "claude-opus-4-6",
1300 Model: anthropic.ModelClaudeOpus4_6,
13011301 MaxTokens: 16000,
13021302 Thinking: anthropic.ThinkingConfigParamOfEnabled(10000),
13031303 Messages: []anthropic.MessageParam{
from line 1314
13141314 AnthropicClient client = AnthropicOkHttpClient.fromEnv();
13151315 
13161316 MessageCreateParams params = MessageCreateParams.builder()
1317 .model("claude-opus-4-6")
1317 .model(Model.CLAUDE_OPUS_4_6)
13181318 .maxTokens(16000L)
13191319 .enabledThinking(10000L)
13201320 .addUserMessage("...")
from line 1420
14201420 
14211421 var parameters = new MessageCreateParams
14221422 {
1423 Model = "claude-opus-5-5",
1423 Model = Model.ClaudeOpus5_5,
14241424 MaxTokens = 16000,
14251425 Thinking = new ThinkingConfigAdaptive(),
14261426 OutputConfig = new OutputConfig { Effort = Effort.High }, // or Max, Xhigh, Medium, Low
from line 1435
14351435 client := anthropic.NewClient()
14361436 
14371437 response, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
1438 Model: "claude-opus-5-5",
1438 Model: anthropic.ModelClaudeOpus5_5,
14391439 MaxTokens: 16000,
14401440 Thinking: anthropic.ThinkingConfigParamUnion{
14411441 OfAdaptive: &anthropic.ThinkingConfigAdaptiveParam{},
from line 1457
14571457 AnthropicClient client = AnthropicOkHttpClient.fromEnv();
14581458 
14591459 MessageCreateParams params = MessageCreateParams.builder()
1460 .model("claude-opus-5-5")
1460 .model(Model.CLAUDE_OPUS_5_5)
14611461 .maxTokens(16000L)
14621462 .thinking(ThinkingConfigAdaptive.builder().build())
14631463 .outputConfig(OutputConfig.builder()
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