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feat(opencode): support adaptive thinking for claude sonnet 4.6 #14283

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Merged
rekram1-node merged 5 commits into from
Feb 19, 2026
+119 −6
Merged

feat(opencode): support adaptive thinking for claude sonnet 4.6 #14283

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1a91c35
support adaptive thinking for claude sonnet 4.6
tctev Feb 19, 2026
8744ef0
fix(opencode): match adaptive anthro ids with hyphen form
tctev Feb 19, 2026
db1b310
Merge branch 'dev' into feat/sonnet-4-6-adaptive-thinking
rekram1-node Feb 19, 2026
17b14c1
Update isAnthropicAdaptive check for model IDs
rekram1-node Feb 19, 2026
8c2caba
tests
rekram1-node Feb 19, 2026
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25 changes: 19 additions & 6 deletions packages/opencode/src/provider/transform.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,8 @@ export namespace ProviderTransform {
if (!model.capabilities.reasoning) return {}

const id = model.id.toLowerCase()
const isAnthropicAdaptive = ["opus-4-6", "opus-4.6", "sonnet-4-6", "sonnet-4.6"].some((v) => model.api.id.includes(v))
const adaptiveEfforts = ["low", "medium", "high", "max"]
if (
id.includes("deepseek") ||
id.includes("minimax") ||
Expand Down Expand Up @@ -366,6 +368,19 @@ export namespace ProviderTransform {

case "@ai-sdk/gateway":
if (model.id.includes("anthropic")) {
if (isAnthropicAdaptive) {
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@rekram1-node rekram1-node Feb 19, 2026

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This will not work

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@rekram1-node rekram1-node Feb 19, 2026

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U removed the 4.6 cases like

opus-4.6 and sonnet-4.6, so isAnthropicAdaptive will never be true for the vercel ai gateway provider

return Object.fromEntries(
adaptiveEfforts.map((effort) => [
effort,
{
thinking: {
type: "adaptive",
},
effort,
},
]),
)
}
return {
high: {
thinking: {
Expand Down Expand Up @@ -502,10 +517,9 @@ export namespace ProviderTransform {
case "@ai-sdk/google-vertex/anthropic":
// https://v5.ai-sdk.dev/providers/ai-sdk-providers/google-vertex#anthropic-provider

if (model.api.id.includes("opus-4-6") || model.api.id.includes("opus-4.6")) {
const efforts = ["low", "medium", "high", "max"]
if (isAnthropicAdaptive) {
return Object.fromEntries(
efforts.map((effort) => [
adaptiveEfforts.map((effort) => [
effort,
{
thinking: {
Expand Down Expand Up @@ -534,10 +548,9 @@ export namespace ProviderTransform {

case "@ai-sdk/amazon-bedrock":
// https://v5.ai-sdk.dev/providers/ai-sdk-providers/amazon-bedrock
if (model.api.id.includes("opus-4-6") || model.api.id.includes("opus-4.6")) {
const efforts = ["low", "medium", "high", "max"]
if (isAnthropicAdaptive) {
return Object.fromEntries(
efforts.map((effort) => [
adaptiveEfforts.map((effort) => [
effort,
{
reasoningConfig: {
Expand Down
100 changes: 100 additions & 0 deletions packages/opencode/test/provider/transform.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1705,6 +1705,66 @@ describe("ProviderTransform.variants", () => {
})

describe("@ai-sdk/gateway", () => {
test("anthropic sonnet 4.6 models return adaptive thinking options", () => {
const model = createMockModel({
id: "anthropic/claude-sonnet-4-6",
providerID: "gateway",
api: {
id: "anthropic/claude-sonnet-4-6",
url: "https://gateway.ai",
npm: "@ai-sdk/gateway",
},
})
const result = ProviderTransform.variants(model)
expect(Object.keys(result)).toEqual(["low", "medium", "high", "max"])
expect(result.medium).toEqual({
thinking: {
type: "adaptive",
},
effort: "medium",
})
})

test("anthropic sonnet 4.6 dot-format models return adaptive thinking options", () => {
const model = createMockModel({
id: "anthropic/claude-sonnet-4-6",
providerID: "gateway",
api: {
id: "anthropic/claude-sonnet-4.6",
url: "https://gateway.ai",
npm: "@ai-sdk/gateway",
},
})
const result = ProviderTransform.variants(model)
expect(Object.keys(result)).toEqual(["low", "medium", "high", "max"])
expect(result.medium).toEqual({
thinking: {
type: "adaptive",
},
effort: "medium",
})
})

test("anthropic opus 4.6 dot-format models return adaptive thinking options", () => {
const model = createMockModel({
id: "anthropic/claude-opus-4-6",
providerID: "gateway",
api: {
id: "anthropic/claude-opus-4.6",
url: "https://gateway.ai",
npm: "@ai-sdk/gateway",
},
})
const result = ProviderTransform.variants(model)
expect(Object.keys(result)).toEqual(["low", "medium", "high", "max"])
expect(result.high).toEqual({
thinking: {
type: "adaptive",
},
effort: "high",
})
})

test("anthropic models return anthropic thinking options", () => {
const model = createMockModel({
id: "anthropic/claude-sonnet-4",
Expand Down Expand Up @@ -2064,6 +2124,26 @@ describe("ProviderTransform.variants", () => {
})

describe("@ai-sdk/anthropic", () => {
test("sonnet 4.6 returns adaptive thinking options", () => {
const model = createMockModel({
id: "anthropic/claude-sonnet-4-6",
providerID: "anthropic",
api: {
id: "claude-sonnet-4-6",
url: "https://api.anthropic.com",
npm: "@ai-sdk/anthropic",
},
})
const result = ProviderTransform.variants(model)
expect(Object.keys(result)).toEqual(["low", "medium", "high", "max"])
expect(result.high).toEqual({
thinking: {
type: "adaptive",
},
effort: "high",
})
})

test("returns high and max with thinking config", () => {
const model = createMockModel({
id: "anthropic/claude-4",
Expand Down Expand Up @@ -2092,6 +2172,26 @@ describe("ProviderTransform.variants", () => {
})

describe("@ai-sdk/amazon-bedrock", () => {
test("anthropic sonnet 4.6 returns adaptive reasoning options", () => {
const model = createMockModel({
id: "bedrock/anthropic-claude-sonnet-4-6",
providerID: "bedrock",
api: {
id: "anthropic.claude-sonnet-4-6",
url: "https://bedrock.amazonaws.com",
npm: "@ai-sdk/amazon-bedrock",
},
})
const result = ProviderTransform.variants(model)
expect(Object.keys(result)).toEqual(["low", "medium", "high", "max"])
expect(result.max).toEqual({
reasoningConfig: {
type: "adaptive",
maxReasoningEffort: "max",
},
})
})

test("returns WIDELY_SUPPORTED_EFFORTS with reasoningConfig", () => {
const model = createMockModel({
id: "bedrock/llama-4",
Expand Down
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