fix(thinking): map budgets to effort for level models

internal/translator/antigravity/openai/chat-completions/antigravity_openai_request.go

@@ -39,7 +39,7 @@ func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _
 	// Note: OpenAI official fields take precedence over extra_body.google.thinking_config
 	re := gjson.GetBytes(rawJSON, "reasoning_effort")
 	hasOfficialThinking := re.Exists()
-	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		switch re.String() {
 		case "none":
 			out, _ = sjson.DeleteBytes(out, "request.generationConfig.thinkingConfig.include_thoughts")
@@ -63,7 +63,8 @@ func ConvertOpenAIRequestToAntigravity(modelName string, inputRawJSON []byte, _
 	}
 
 	// Cherry Studio extension extra_body.google.thinking_config (effective only when official fields are absent)
-	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	// Only apply for models that use numeric budgets, not discrete levels.
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		if tc := gjson.GetBytes(rawJSON, "extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
 			var setBudget bool
 			var budget int

internal/translator/claude/gemini/claude_gemini_request.go

@@ -114,7 +114,8 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 			}
 		}
 		// Include thoughts configuration for reasoning process visibility
-		if thinkingConfig := genConfig.Get("thinkingConfig"); thinkingConfig.Exists() && thinkingConfig.IsObject() {
+		// Only apply for models that use numeric budgets, not discrete levels.
+		if thinkingConfig := genConfig.Get("thinkingConfig"); thinkingConfig.Exists() && thinkingConfig.IsObject() && !util.ModelUsesThinkingLevels(modelName) {
 			if includeThoughts := thinkingConfig.Get("include_thoughts"); includeThoughts.Exists() {
 				if includeThoughts.Type == gjson.True {
 					out, _ = sjson.Set(out, "thinking.type", "enabled")

internal/translator/codex/claude/codex_claude_request.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/misc"
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -214,7 +215,22 @@ func ConvertClaudeRequestToCodex(modelName string, inputRawJSON []byte, _ bool)
 
 	// Add additional configuration parameters for the Codex API.
 	template, _ = sjson.Set(template, "parallel_tool_calls", true)
-	template, _ = sjson.Set(template, "reasoning.effort", "medium")
+
+	// Convert thinking.budget_tokens to reasoning.effort for level-based models
+	reasoningEffort := "medium" // default
+	if thinking := rootResult.Get("thinking"); thinking.Exists() && thinking.IsObject() {
+		if thinking.Get("type").String() == "enabled" {
+			if util.ModelUsesThinkingLevels(modelName) {
+				if budgetTokens := thinking.Get("budget_tokens"); budgetTokens.Exists() {
+					budget := int(budgetTokens.Int())
+					if effort, ok := util.OpenAIThinkingBudgetToEffort(modelName, budget); ok && effort != "" {
+						reasoningEffort = effort
+					}
+				}
+			}
+		}
+	}
+	template, _ = sjson.Set(template, "reasoning.effort", reasoningEffort)
 	template, _ = sjson.Set(template, "reasoning.summary", "auto")
 	template, _ = sjson.Set(template, "stream", true)
 	template, _ = sjson.Set(template, "store", false)

internal/translator/codex/gemini/codex_gemini_request.go

@@ -245,7 +245,22 @@ func ConvertGeminiRequestToCodex(modelName string, inputRawJSON []byte, _ bool)
 
 	// Fixed flags aligning with Codex expectations
 	out, _ = sjson.Set(out, "parallel_tool_calls", true)
-	out, _ = sjson.Set(out, "reasoning.effort", "medium")
+
+	// Convert thinkingBudget to reasoning.effort for level-based models
+	reasoningEffort := "medium" // default
+	if genConfig := root.Get("generationConfig"); genConfig.Exists() {
+		if thinkingConfig := genConfig.Get("thinkingConfig"); thinkingConfig.Exists() && thinkingConfig.IsObject() {
+			if util.ModelUsesThinkingLevels(modelName) {
+				if thinkingBudget := thinkingConfig.Get("thinkingBudget"); thinkingBudget.Exists() {
+					budget := int(thinkingBudget.Int())
+					if effort, ok := util.OpenAIThinkingBudgetToEffort(modelName, budget); ok && effort != "" {
+						reasoningEffort = effort
+					}
+				}
+			}
+		}
+	}
+	out, _ = sjson.Set(out, "reasoning.effort", reasoningEffort)
 	out, _ = sjson.Set(out, "reasoning.summary", "auto")
 	out, _ = sjson.Set(out, "stream", true)
 	out, _ = sjson.Set(out, "store", false)

internal/translator/gemini-cli/openai/chat-completions/gemini-cli_openai_request.go

@@ -39,7 +39,7 @@ func ConvertOpenAIRequestToGeminiCLI(modelName string, inputRawJSON []byte, _ bo
 	// Note: OpenAI official fields take precedence over extra_body.google.thinking_config
 	re := gjson.GetBytes(rawJSON, "reasoning_effort")
 	hasOfficialThinking := re.Exists()
-	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		switch re.String() {
 		case "none":
 			out, _ = sjson.DeleteBytes(out, "request.generationConfig.thinkingConfig.include_thoughts")
@@ -63,7 +63,8 @@ func ConvertOpenAIRequestToGeminiCLI(modelName string, inputRawJSON []byte, _ bo
 	}
 
 	// Cherry Studio extension extra_body.google.thinking_config (effective only when official fields are absent)
-	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	// Only apply for models that use numeric budgets, not discrete levels.
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		if tc := gjson.GetBytes(rawJSON, "extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
 			var setBudget bool
 			var budget int

internal/translator/gemini/claude/gemini_claude_request.go

@@ -154,7 +154,8 @@ func ConvertClaudeRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 	}
 
 	// Map Anthropic thinking -> Gemini thinkingBudget/include_thoughts when enabled
-	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() && util.ModelSupportsThinking(modelName) {
+	// Only apply for models that use numeric budgets, not discrete levels.
+	if t := gjson.GetBytes(rawJSON, "thinking"); t.Exists() && t.IsObject() && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		if t.Get("type").String() == "enabled" {
 			if b := t.Get("budget_tokens"); b.Exists() && b.Type == gjson.Number {
 				budget := int(b.Int())

internal/translator/gemini/openai/chat-completions/gemini_openai_request.go

@@ -37,9 +37,11 @@ func ConvertOpenAIRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 
 	// Reasoning effort -> thinkingBudget/include_thoughts
 	// Note: OpenAI official fields take precedence over extra_body.google.thinking_config
+	// Only convert for models that use numeric budgets (not discrete levels) to avoid
+	// incorrectly applying thinkingBudget for level-based models like gpt-5.
 	re := gjson.GetBytes(rawJSON, "reasoning_effort")
 	hasOfficialThinking := re.Exists()
-	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		switch re.String() {
 		case "none":
 			out, _ = sjson.DeleteBytes(out, "generationConfig.thinkingConfig.include_thoughts")
@@ -63,7 +65,8 @@ func ConvertOpenAIRequestToGemini(modelName string, inputRawJSON []byte, _ bool)
 	}
 
 	// Cherry Studio extension extra_body.google.thinking_config (effective only when official fields are absent)
-	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	// Only apply for models that use numeric budgets, not discrete levels.
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		if tc := gjson.GetBytes(rawJSON, "extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
 			var setBudget bool
 			var budget int

internal/translator/gemini/openai/responses/gemini_openai-responses_request.go

@@ -389,8 +389,9 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 	}
 
 	// OpenAI official reasoning fields take precedence
+	// Only convert for models that use numeric budgets (not discrete levels).
 	hasOfficialThinking := root.Get("reasoning.effort").Exists()
-	if hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	if hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		reasoningEffort := root.Get("reasoning.effort")
 		switch reasoningEffort.String() {
 		case "none":
@@ -418,7 +419,8 @@ func ConvertOpenAIResponsesRequestToGemini(modelName string, inputRawJSON []byte
 	}
 
 	// Cherry Studio extension (applies only when official fields are missing)
-	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) {
+	// Only apply for models that use numeric budgets, not discrete levels.
+	if !hasOfficialThinking && util.ModelSupportsThinking(modelName) && !util.ModelUsesThinkingLevels(modelName) {
 		if tc := root.Get("extra_body.google.thinking_config"); tc.Exists() && tc.IsObject() {
 			var setBudget bool
 			var budget int

internal/translator/openai/claude/openai_claude_request.go

@@ -10,6 +10,7 @@ import (
 	"encoding/json"
 	"strings"
 
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -60,6 +61,18 @@ func ConvertClaudeRequestToOpenAI(modelName string, inputRawJSON []byte, stream
 	// Stream
 	out, _ = sjson.Set(out, "stream", stream)
 
+	// Thinking: Convert Claude thinking.budget_tokens to OpenAI reasoning_effort
+	if thinking := root.Get("thinking"); thinking.Exists() && thinking.IsObject() {
+		if thinkingType := thinking.Get("type"); thinkingType.Exists() && thinkingType.String() == "enabled" {
+			if budgetTokens := thinking.Get("budget_tokens"); budgetTokens.Exists() {
+				budget := int(budgetTokens.Int())
+				if effort, ok := util.OpenAIThinkingBudgetToEffort(modelName, budget); ok && effort != "" {
+					out, _ = sjson.Set(out, "reasoning_effort", effort)
+				}
+			}
+		}
+	}
+
 	// Process messages and system
 	var messagesJSON = "[]"
 

internal/translator/openai/gemini/openai_gemini_request.go

@@ -13,6 +13,7 @@ import (
 	"math/big"
 	"strings"
 
+	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -76,6 +77,18 @@ func ConvertGeminiRequestToOpenAI(modelName string, inputRawJSON []byte, stream
 				out, _ = sjson.Set(out, "stop", stops)
 			}
 		}
+
+		// Convert thinkingBudget to reasoning_effort for level-based models
+		if thinkingConfig := genConfig.Get("thinkingConfig"); thinkingConfig.Exists() && thinkingConfig.IsObject() {
+			if util.ModelUsesThinkingLevels(modelName) {
+				if thinkingBudget := thinkingConfig.Get("thinkingBudget"); thinkingBudget.Exists() {
+					budget := int(thinkingBudget.Int())
+					if effort, ok := util.OpenAIThinkingBudgetToEffort(modelName, budget); ok && effort != "" {
+						out, _ = sjson.Set(out, "reasoning_effort", effort)
+					}
+				}
+			}
+		}
 	}
 
 	// Stream parameter