Skip to main content
idapt
HomeAI ModelsExploreResourcesPricing
Sign inUse for Free
  • Home
  • Pricing
  • AI Models
  • Skills
  • Image models
  • Voice models
  • Video models
  • Rankings
  • Multi-Model Chat
  • Agents
  • Computers
  • Drive
  • Automations
  • AI Gateway
  • All features →
  • Blog
  • About
  • Comparisons
  • Benchmarks
  • Model Match
  • Demos
  • Help center
  • FAQ
  • Privacy
  • Support
  • Developers
  • Quickstarts
  • API reference
  • API pricing
  • CLI
  • MCP
  • Migrate
  • Downloads
  • Desktop
© idapt[email protected]TermsPrivacy PolicyLegal noticeReport content
X (Twitter)Discord

GPT 5.3 Codex vs GPT 6 Luna

At a glance

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92

OpenAI's fastest, most affordable GPT-6 tier for high-volume, latency-sensitive work.

1.1M ctx$0.10/$0.50 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Capability
CapabilityECI87.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Novel Reasoning—Task Horizon5.8h
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper96%
Capability
Capability—
Reasoning & Knowledge
Graduate Science90.5%Factual Recall41.4%
Math
Competition Math98.9%
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning59.3%Task Horizon—
Specs
400K
Context
128K
Max output
Feb 2026
Released
1.1M
Context
128K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input94%$0.10/M tokens
Output96%$0.50/M tokens
Cache read94%$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Chat with GPT 5.3 CodexGo to model
Chat with GPT 6 LunaGo to model
Frequently Asked Questions: GPT 5.3 Codex vs GPT 6 Luna▼

Which is better, GPT 5.3 Codex or GPT 6 Luna?

▼

Both GPT 5.3 Codex and GPT 6 Luna are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.3 Codex or GPT 6 Luna?

▼

GPT 6 Luna has a lower blended cost. GPT 5.3 Codex: $1.75 input / $14.00 output. GPT 6 Luna: $0.10 input / $0.50 output.

Which has a larger context window, GPT 5.3 Codex or GPT 6 Luna?

▼

GPT 6 Luna has a larger context window: GPT 5.3 Codex supports 400K tokens vs GPT 6 Luna at 1.1M tokens.

Do both GPT 5.3 Codex and GPT 6 Luna support vision?

▼

Yes, both GPT 5.3 Codex and GPT 6 Luna support vision/image input.

What are the key differences between GPT 5.3 Codex and GPT 6 Luna?

▼

Key differences: GPT 6 Luna is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.3 Codex and GPT 6 Luna for free on idapt.app to see which performs better for your specific needs.

Open in App