feat(anthropic): add Claude 4.5 Haiku model and update logging for thought display

This commit introduces the Claude 4.5 Haiku model to the Anthropic integration, including its pricing and token limits. Additionally, it enhances the logging functionality to better format and display thought information in the output.

Author: dosco

src/ax/ai/anthropic/info.ts

@@ -3,6 +3,16 @@ import type { AxModelInfo } from '../types.js';
 import { AxAIAnthropicModel } from './types.js';
 
 export const axModelInfoAnthropic: AxModelInfo[] = [
+  // 4.5 Haiku (2025-10)
+  {
+    name: AxAIAnthropicModel.Claude45Haiku,
+    currency: 'usd',
+    // Pricing per Anthropic announcement: $1 input / $5 output per 1M tokens
+    promptTokenCostPer1M: 1.0,
+    completionTokenCostPer1M: 5.0,
+    maxTokens: 200000, // match modern context window similar to Sonnet 4.5 era
+    supported: { thinkingBudget: true, showThoughts: true },
+  },
   // 4
   {
     name: AxAIAnthropicModel.Claude41Opus,

src/ax/ai/anthropic/types.ts

@@ -4,6 +4,7 @@ export enum AxAIAnthropicModel {
   Claude41Opus = 'claude-opus-4-1-20250805',
   Claude4Opus = 'claude-opus-4-20250514',
   Claude4Sonnet = 'claude-sonnet-4-20250514',
+  Claude45Haiku = 'claude-haiku-4-5',
   Claude37Sonnet = 'claude-3-7-sonnet-latest',
 
   Claude35Sonnet = 'claude-3-5-sonnet-latest',

src/ax/dsp/loggers.ts

@@ -128,7 +128,7 @@ export const axCreateDefaultColorLogger = (
           if (result.thoughtBlock?.data || result.thought) {
             lines.push(
               cl.gray(
-                `[thought${result.thoughtBlock?.encrypted ? ' (redacted)' : ''}] ` +
+                `[THOUGHT${result.thoughtBlock?.encrypted ? ' (redacted)' : ''}]\n` +
                   (result.thoughtBlock?.data ?? result.thought ?? '')
               )
             );
@@ -149,15 +149,24 @@ export const axCreateDefaultColorLogger = (
         const streamingContent =
           thought || typedData.value.delta || typedData.value.content || '';
         formattedMessage = thought
-          ? cl.gray(`[thought] ${thought}`)
+          ? cl.gray(`[THOUGHT]\n${thought}`)
           : cl.cyanBright(streamingContent);
-        return;
+        break;
       }
       case 'ChatResponseStreamingDoneResult': {
         formattedMessage = `\n${cl.cyanBright('[ CHAT RESPONSE ]')}\n${divider}\n`;
         if (typedData.value.content) {
           formattedMessage += cl.cyanBright(typedData.value.content);
         }
+        if (typedData.value.thoughtBlock?.data || typedData.value.thought) {
+          formattedMessage += `\n`;
+          formattedMessage += cl.gray(
+            `[THOUGHT${typedData.value.thoughtBlock?.encrypted ? ' (redacted)' : ''}]\n` +
+              (typedData.value.thoughtBlock?.data ??
+                typedData.value.thought ??
+                '')
+          );
+        }
         if (typedData.value.functionCalls) {
           formattedMessage += cl.cyanBright(
             JSON.stringify(typedData.value.functionCalls, null, 2)
@@ -279,7 +288,20 @@ export const axCreateDefaultTextLogger = (
       case 'ChatResponseResults':
         formattedMessage = '\n[ CHAT RESPONSE ]\n';
         typedData.value.forEach((result, i) => {
-          formattedMessage += result.content || '[No content]';
+          const lines: string[] = [];
+          if (result.thoughtBlock?.data || result.thought) {
+            lines.push(
+              `[thought${result.thoughtBlock?.encrypted ? ' (redacted)' : ''}] ` +
+                (result.thoughtBlock?.data ?? result.thought ?? '')
+            );
+          }
+          if (result.content) {
+            lines.push(result.content);
+          }
+          if (lines.length === 0) {
+            lines.push('[No content]');
+          }
+          formattedMessage += lines.join('\n');
           if (i < typedData.value.length - 1)
             formattedMessage += `\n${divider}\n`;
         });
@@ -296,6 +318,14 @@ export const axCreateDefaultTextLogger = (
         if (typedData.value.content) {
           formattedMessage += typedData.value.content;
         }
+        if (typedData.value.thoughtBlock?.data || typedData.value.thought) {
+          formattedMessage += `\n`;
+          formattedMessage +=
+            `[thought${typedData.value.thoughtBlock?.encrypted ? ' (redacted)' : ''}] ` +
+            (typedData.value.thoughtBlock?.data ??
+              typedData.value.thought ??
+              '');
+        }
         if (typedData.value.functionCalls) {
           formattedMessage += JSON.stringify(
             typedData.value.functionCalls,

src/examples/anthropic-thinking-separation.ts

@@ -7,13 +7,13 @@ export const reasoningGen = ax(
   'userQuestion:string "User question" -> responseText:string "Final answer", thought?:string "Reasoning tokens (if available)"'
 );
 
-console.log('=== Anthropic thinking separation demo ===');
+console.log('=== Anthropic thinking  demo ===');
 
 const llmWithThoughts = ai({
   name: 'anthropic',
   apiKey: process.env.ANTHROPIC_APIKEY!,
   config: {
-    model: AxAIAnthropicModel.Claude37Sonnet,
+    model: AxAIAnthropicModel.Claude4Sonnet,
     stream: false,
     temperature: 0.1,
   },
@@ -23,33 +23,15 @@ const llmWithThoughts = ai({
   },
 });
 
-const withThoughts = await reasoningGen.forward(llmWithThoughts, {
-  userQuestion:
-    'In one sentence, explain why the sky appears blue on a clear day.',
-});
-
-console.log('[showThoughts=true] answer:', withThoughts.responseText);
-if (withThoughts.thought)
-  console.log('[showThoughts=true] thought:', withThoughts.thought);
-
-const llmNoThoughts = ai({
-  name: 'anthropic',
-  apiKey: process.env.ANTHROPIC_APIKEY!,
-  config: {
-    model: AxAIAnthropicModel.Claude37Sonnet,
-    stream: false,
-    temperature: 0.1,
+await reasoningGen.forward(
+  llmWithThoughts,
+  {
+    userQuestion:
+      'In one sentence, explain why the sky appears blue on a clear day.',
   },
-  options: {
+  {
+    showThoughts: true,
     thinkingTokenBudget: 'low',
-    showThoughts: false,
-  },
-});
-
-const noThoughts = await reasoningGen.forward(llmNoThoughts, {
-  userQuestion:
-    'In one sentence, explain why the sky appears blue on a clear day.',
-});
-
-console.log('[showThoughts=false] answer:', noThoughts.responseText);
-console.log('[showThoughts=false] thought:', String(noThoughts.thought ?? ''));
+    debug: true,
+  }
+);