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Gemini 3.5 Flash-Lite vs GPT-5.2-Codex

Detailed technical comparison between Gemini 3.5 Flash-Lite (Google) and GPT-5.2-Codex (OpenAI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

Gemini 3.5 Flash-Lite: 0 WinsvsGPT-5.2-Codex: 6 Wins
Context Leader

Gemini 3.5 Flash-Lite

1,048,576 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

Gemini 3.5 Flash-Lite

$0.30 / MTok
Googleactive

Gemini 3.5 Flash-Lite

Gemini 3.5 Flash-Lite is a high-efficiency model from Google with upgraded agentic capabilities. It is suited for subagents that execute focused tasks within complex, multi-agent workflows.

View Gemini 3.5 Flash-Lite Full Specs →
OpenAIactive

GPT-5.2-Codex

GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

View GPT-5.2-Codex Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGemini 3.5 Flash-LiteGPT-5.2-Codex
ProviderGoogleOpenAI
Context Window1,048,576 tokens🏆400,000 tokens
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apimanaged api
Production Stabilitybetastable
API AvailableYesYes
Released Date2026-07-212026-01-14

API Pricing Comparison

Input Price per Million Tokens

Gemini 3.5 Flash-Lite

$0.30

GPT-5.2-Codex

$1.75

Output Price per Million Tokens

Gemini 3.5 Flash-Lite

$2.50

GPT-5.2-Codex

$14.00

💡 Cost Ratio: Gemini 3.5 Flash-Lite is 5.8x cheaper per input token than GPT-5.2-Codex.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
73.2%vs93.0%+19.8% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆
HumanEvalPython coding & logic synthesis
69.4%vs99.0%+29.6% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆
MATHComplex mathematical problem solving
42.6%vs81.4%+38.8% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆
GPQAGraduate-level expert reasoning
30.0%vs56.4%+26.4% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆
HellaSwagCommonsense reasoning and inference
77.2%vs88.6%+11.4% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆
MT-BenchMulti-turn conversation flow quality
8.0%vs9.5%+1.5% GPT-5.2-Codex
Gemini 3.5 Flash-Lite
GPT-5.2-Codex 🏆

Gemini 3.5 Flash-Lite Quirks & Gotchas

No developer gotchas reported.

GPT-5.2-Codex Quirks & Gotchas

No developer gotchas reported.

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