GPT-4o vs GPT-5.3 Codex
Compare OpenAI and OpenAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-4o
GPT-5.3 Codex
Cost Differences
GPT-5.3 Codex costs more than GPT-4o
Feature Comparison
| Feature | GPT-4o | GPT-5.3 Codex |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input Price | $2.50/1M tokens | $1.75/1M tokens |
| Output Price | $10.00/1M tokens | $14.00/1M tokens |
| Context Window | 128,000 tokens | 256,000 tokens |
| Max Output | 16,384 tokens | 32,768 tokens |
| Category | flagship | coding |
| Capabilities | textvisionaudio | textcode |
| Release Date | 5/13/2024 | 3/1/2026 |
GPT-4o vs GPT-5.3 Codex: Which Should You Choose?
Choosing between GPT-4o and GPT-5.3 Codex depends on your priorities: cost efficiency, context length, or raw capability. GPT-4o is the more affordable option at $2.50/1M input tokens. Meanwhile, GPT-5.3 Codex offers a significantly larger context window at 256,000 tokens vs 128,000 for GPT-4o.
These models target different tiers: GPT-4o is a flagship model while GPT-5.3 Codex is coding. This means they're optimized for different workloads. GPT-4o is built for complex tasks that require deeper reasoning, while GPT-5.3 Codex offers better value for routine operations.
Output costs matter too. GPT-4o charges $10.00/1M output tokens vs $14.00 for GPT-5.3 Codex. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-4o has the edge here at $10.00/1M output tokens.
Multimodal capabilities: GPT-4o supports vision (image inputs) while GPT-5.3 Codex is text-only. If your application needs image understanding, this narrows your choice.
Best Use Cases
Choose GPT-4o when:
- • You need more capabilities (vision, audio)
- • You're already using OpenAI's API ecosystem
Choose GPT-5.3 Codex when:
- • Budget is a primary concern
- • You need a larger context window (256,000 tokens)
- • You need longer outputs (up to 32,768 tokens)
- • You're already using OpenAI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-4o (OpenAI)
GPT-5.3 Codex (OpenAI)
Start using GPT-4o today
Sign Up for OpenAI →Start using GPT-5.3 Codex today
Sign Up for OpenAI →