Add Claude Opus 4.6 model with adaptive thinking support by marius-kilocode · Pull Request #5686 · Kilo-Org/kilocode

marius-kilocode · 2026-02-05T18:14:47Z

Summary

Adds Claude Opus 4.6 model definition for Anthropic and Vertex providers
Implements adaptive thinking support with new beta flags (adaptive-thinking-2026-01-28, interleaved-thinking-2025-05-14, effort-2025-11-24, max-effort-2026-01-24)
Extends verbosity levels to include "max" and updates supportsVerbosity to accept an array of allowed levels
Adds supportsAdaptiveThinking model capability flag
Caps OpenRouter verbosity at "high" when "max" is selected
Adds "Max" verbosity label to all locale files

changeset-bot · 2026-02-05T18:14:53Z

🦋 Changeset detected

Latest commit: e6c26b7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
kilo-code	Patch

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kiloconnect · 2026-02-05T18:23:35Z

packages/types/src/model.ts

 	promptCacheRetention: z.enum(["in_memory", "24h"]).optional(),
 	// Capability flag to indicate whether the model supports an output verbosity parameter
-	supportsVerbosity: z.boolean().optional(),
+	supportsVerbosity: z.union([z.boolean(), z.array(z.enum(verbosityLevels))]).optional(), // kilocode_change


WARNING: supportsVerbosity now allows boolean | VerbosityLevel[], but most call sites still treat it as a simple truthy flag

If supportsVerbosity is an array, consumers should validate that the requested verbosity is included (vs relying on truthiness), otherwise unsupported values (e.g. "max") can be propagated to providers that don’t actually accept them.

kiloconnect · 2026-02-05T18:23:35Z

src/api/transform/model-params.ts

-	if (shouldUseReasoningBudget({ model, settings })) {
+	// kilocode_change start
+	if (model.supportsAdaptiveThinking && settings.enableReasoningEffort !== false) {
+		temperature = 1.0


WARNING: Adaptive thinking branch hard-overrides temperature to 1.0

This overrides a user-specified temperature (settings.modelTemperature) as well. If the API requires temperature = 1.0 only when adaptive thinking is actually used, consider scoping the override to that condition and/or documenting that temperature will be ignored for adaptive-thinking models.

kiloconnect · 2026-02-05T18:23:35Z

src/api/transform/reasoning.ts

-	shouldUseReasoningBudget({ model, settings }) ? { type: "enabled", budget_tokens: reasoningBudget! } : undefined
+}: GetModelReasoningOptions): AnthropicReasoningParams | undefined => {
+	// kilocode_change start
+	if (model.supportsAdaptiveThinking && settings?.enableReasoningEffort !== false) {


WARNING: Adaptive thinking is auto-enabled by default for any model with supportsAdaptiveThinking

Because the condition is supportsAdaptiveThinking && enableReasoningEffort !== false, users who haven’t explicitly opted into reasoning may still get adaptive thinking (cost/latency impact). If the intended behavior is opt-in, consider additionally gating on a user selection (e.g. reasoning effort/verbosity choice) rather than only the legacy boolean flag.

kiloconnect · 2026-02-05T18:23:35Z

src/api/providers/anthropic.ts

 							max_tokens: maxTokens ?? ANTHROPIC_DEFAULT_MAX_TOKENS,
 							temperature,
-							thinking,
+							thinking: thinking as Anthropic.Messages.ThinkingConfigParam | undefined, // kilocode_change


WARNING: thinking is cast to Anthropic.Messages.ThinkingConfigParam

With thinking potentially being { type: "adaptive" }, this cast bypasses SDK type safety. If the SDK/API shape differs (or the beta flag set is incomplete), this will fail at runtime. Consider updating the SDK types/version or narrowing/validating thinking before sending.

kiloconnect · 2026-02-05T18:23:35Z

packages/types/src/providers/vertex.ts

+		cacheWritesPrice: 6.25,
+		cacheReadsPrice: 0.5,
+		supportsAdaptiveThinking: true,
+		supportsVerbosity: ["low", "medium", "high", "max"],


SUGGESTION: supportsVerbosity is declared with explicit levels (including max)

Make sure the Vertex provider path actually applies verbosity to requests (or that the UI/CLI treats this as informational only). Otherwise users may see a verbosity control that has no effect for Vertex-backed Claude models.

kiloconnect · 2026-02-05T18:23:48Z

Code Review Summary

Status: 4 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	4
SUGGESTION	1

Fix these issues in Kilo Cloud

Issue Details (click to expand)

WARNING

File	Line	Issue
`packages/types/src/model.ts`	84	`supportsVerbosity` is now `boolean
`src/api/transform/model-params.ts`	105	Adaptive-thinking path hard-overrides `temperature` to `1.0`, overriding user-provided temperature settings.
`src/api/transform/reasoning.ts`	116	Adaptive thinking auto-enables by default when `enableReasoningEffort !== false` (may be unexpected cost/latency impact).
`src/api/providers/anthropic.ts`	156	`thinking` is cast to `ThinkingConfigParam` even when `{ type: "adaptive" }` (bypasses type safety; potential runtime mismatch).

SUGGESTION

File	Line	Issue
`packages/types/src/providers/vertex.ts`	22	Ensure Vertex request path actually applies verbosity, otherwise UI/CLI may expose a no-op setting.

Files Reviewed (7 files)

.changeset/bright-ants-wonder.md - 0 issues
cli/src/constants/providers/models.ts - 0 issues
packages/types/src/model.ts - 1 issue
packages/types/src/providers/anthropic.ts - 0 issues
packages/types/src/providers/vertex.ts - 1 issue
src/api/providers/anthropic.ts - 1 issue
src/api/transform/model-params.ts - 1 issue
src/api/transform/reasoning.ts - 1 issue
src/api/providers/openrouter.ts - 0 issues
src/api/providers/anthropic-vertex.ts - 0 issues

PoCk3T · 2026-02-05T21:21:28Z

@kevinvandijk it doesn't look like Opus 4.6 via Vertex AI is working, I'm getting:

Date/time: 2026-02-05T21:20:20.219Z
Extension version: 5.4.0
Provider: vertex
Model: claude-opus-4-6@vertex

404
404 [{"error":{"code":404,"message":"Requested entity was not found.","status":"NOT_FOUND"}}]

PS: I already enabled Opus 4.6 in my Vertex AI Model Garden

PoCk3T · 2026-02-05T23:43:28Z

Opened #5693 to have a dedicated tracking of the issue

Add new model

7383380

kevinvandijk approved these changes Feb 5, 2026

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kevinvandijk mentioned this pull request Feb 5, 2026

Add support for Claude Opus 4.6 #5684

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kevinvandijk enabled auto-merge February 5, 2026 18:20

kiloconnect bot reviewed Feb 5, 2026

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kevinvandijk merged commit 6fc1c85 into main Feb 5, 2026
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kevinvandijk deleted the model-change branch February 5, 2026 18:28

github-actions bot mentioned this pull request Feb 5, 2026

Changeset version bump #5676

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Add Claude Opus 4.6 model with adaptive thinking support#5686

Add Claude Opus 4.6 model with adaptive thinking support#5686
kevinvandijk merged 2 commits intomainfrom
model-change

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marius-kilocode commented Feb 5, 2026

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Code Review Summary

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