GPT-5.3-Codex
by OpenAI · openai/gpt-5.3-codex · #365 cheapest of 422 paid models
Prices updated Sep 20, 2026, 12:34 AM UTC · refreshed hourly
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5Gemini 3.6 Flash
Pricing
Input
$1.75
per 1M tokens
Output
$14.00
per 1M tokens
Blended (3:1)
$4.81
3 input : 1 output
Cache read
$0.175
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for GPT-5.3-Codex with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $4.81 | $0.1925 | — |
| 50% | $4.22 | $0.1138 | −41% |
| 90% | $3.75 | $0.0508 | −74% |
*Example: 100K sticky context + 2K new input + 1K output. Batch discount is an approximate 50% off list rates for this provider’s batch API. Confirm on the vendor’s pricing page.
What a request costs
| Workload | Input tokens | Output tokens | Cost / request | Cost / 1K requests |
|---|---|---|---|---|
| Short chat message | 500 | 300 | $0.005075 | $5.07 |
| Document summary | 8,000 | 1,000 | $0.028 | $28.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.0805 | $80.50 |
| Long-context analysis | 150,000 | 5,000 | $0.3325 | $332.50 |
Performance
Intelligence Index
32.5
AA composite quality
Coding Index
—
Math Index
—
Agentic Index
—
Output speed
154 tok/s
median
Time to first token
43.34s
median
Time to first answer
43.34s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 91.5% |
| Humanity's Last Exam | 42.5% |
| IFBench | 75.4% |
| AA-LCR (Long Context Reasoning) | 83.3% |
| Terminal-Bench Hard | 53.0% |
| τ²-Bench (Telecom) | 86.0% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,175 |
| Web apps | 1,048 |
| Full-stack | 993 |
| Mobile apps | 1,083 |
| Android native | 1,084 |
| UI components | 1,152 |
| Data viz | 1,179 |
| SVG | 1,153 |
| 3D | 1,037 |
| Game dev | 1,185 |
| Godot game dev | 1,124 |
| Code categories | 1,160 |
| ASCII art | 1,170 |
Specs
Context window
400K
tokens
Max output
128K
tokens
Input modalities
text, image, file
Tokenizer
GPT