fix(pricing): add OpenAI/Codex model pricing, stop hardcoding cost to $0

Codex CLI sessions always reported $0 estimated cost because
estimatedCostUsd was hardcoded in codex.ts, and the shared pricing
table had no entries for any OpenAI/GPT model at all. Adds pricing
for the current GPT-5.x/Codex, GPT-4.x, and o-series models, and
wires codex.ts to actually calculate cost from usage.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: ClaudiaFang

cli/src/providers/codex.ts

@@ -4,6 +4,7 @@ import * as os from 'os';
 import type { SessionProvider } from './types.js';
 import type { ParsedSession, ParsedMessage, ToolCall, ToolResult, SessionUsage, MessageUsage } from '../types.js';
 import { generateTitle, detectSessionCharacter } from '../parser/titles.js';
+import { calculateCost } from '../utils/pricing.js';
 
 /**
  * OpenAI Codex CLI session provider.
@@ -657,7 +658,14 @@ function buildSession(
     totalOutputTokens: totalOutput,
     cacheCreationTokens: 0,
     cacheReadTokens: totalCached,
-    estimatedCostUsd: 0, // Codex pricing not public
+    estimatedCostUsd: calculateCost([{
+      model: model || 'unknown',
+      usage: {
+        input_tokens: totalInput,
+        output_tokens: totalOutput,
+        cache_read_input_tokens: totalCached,
+      },
+    }]),
     modelsUsed: model ? [model] : [],
     primaryModel: model || 'unknown',
     usageSource: 'jsonl',

cli/src/utils/pricing.test.ts

@@ -24,10 +24,15 @@ describe('getModelPricing', () => {
   });
 
   it('returns default pricing for unknown model', () => {
-    const pricing = getModelPricing('gpt-4o-mini');
+    const pricing = getModelPricing('some-unrecognized-model-xyz');
     expect(pricing).toEqual({ input: 3, output: 15 });
   });
 
+  it('returns exact match for a gpt-5.x codex model', () => {
+    const pricing = getModelPricing('gpt-5.6-terra');
+    expect(pricing).toEqual({ input: 2.5, output: 15 });
+  });
+
   it('returns default pricing for empty string', () => {
     const pricing = getModelPricing('');
     expect(pricing).toEqual({ input: 3, output: 15 });

cli/src/utils/pricing.ts

@@ -48,6 +48,44 @@ const MODEL_PRICING: Record<string, ModelPricing> = {
   'gemini-1.5-flash':          { input: 0.075, output: 0.3 },
   'gemini-3.1-pro':            { input: 3.5,  output: 10.5 },
   'gemini-3.1-flash':          { input: 0.1,  output: 0.4 },
+
+  // OpenAI GPT-5.x family (incl. Codex CLI models) — longest/most-specific keys first
+  'gpt-5.6-luna':              { input: 1,    output: 6 },
+  'gpt-5.6-sol':               { input: 5,    output: 30 },
+  'gpt-5.6-terra':             { input: 2.5,  output: 15 },
+  'gpt-5.6':                   { input: 5,    output: 30 }, // alias for gpt-5.6-sol
+  'gpt-5.5-pro':               { input: 30,   output: 180 },
+  'gpt-5.5':                   { input: 5,    output: 30 },
+  'gpt-5.4-mini':              { input: 0.75, output: 4.5 },
+  'gpt-5.4-nano':              { input: 0.2,  output: 1.25 },
+  'gpt-5.4-pro':               { input: 30,   output: 180 },
+  'gpt-5.4':                   { input: 2.5,  output: 15 },
+  'gpt-5.3-codex':             { input: 1.75, output: 14 },
+  'gpt-5.2':                   { input: 1.75, output: 14 },
+  'gpt-5.1':                   { input: 1.25, output: 10 },
+  'gpt-5-codex':               { input: 1.25, output: 10 },
+  'gpt-5-mini':                { input: 0.25, output: 2 },
+  'gpt-5-nano':                { input: 0.05, output: 0.4 },
+  'gpt-5-pro':                 { input: 15,   output: 120 },
+  'gpt-5':                     { input: 1.25, output: 10 },
+
+  // OpenAI GPT-4.x family
+  'gpt-4.1-mini':              { input: 0.4,  output: 1.6 },
+  'gpt-4.1-nano':              { input: 0.1,  output: 0.4 },
+  'gpt-4.1':                   { input: 2,    output: 8 },
+  'gpt-4o-mini':               { input: 0.15, output: 0.6 },
+  'gpt-4o':                    { input: 2.5,  output: 10 },
+
+  // OpenAI o-series (reasoning models)
+  'o1-mini':                   { input: 1.1,  output: 4.4 },
+  'o1-pro':                    { input: 150,  output: 600 },
+  'o1':                        { input: 15,   output: 60 },
+  'o3-deep-research':          { input: 10,   output: 40 },
+  'o3-mini':                   { input: 1.1,  output: 4.4 },
+  'o3-pro':                    { input: 20,   output: 80 },
+  'o3':                        { input: 2,    output: 8 },
+  'o4-mini-deep-research':     { input: 2,    output: 8 },
+  'o4-mini':                   { input: 1.1,  output: 4.4 },
 };
 
 // Default fallback pricing (sonnet-level)