GPT-5.5
by OpenAI · openai/gpt-5.5 · #304 cheapest of 325 paid models
Prices updated Jul 22, 2026, 1:31 AM UTC · refreshed hourly
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Compare vs:Claude Sonnet 5Claude Opus 4.6Claude Haiku 4.5Gemini 3.6 Flash
Pricing
Input
$5.00
per 1M tokens
Output
$30.00
per 1M tokens
Blended (3:1)
$11.25
3 input : 1 output
Cache read
$0.50
per 1M cached tokens
Cache write
—
per 1M tokens
Cache & batch economics
Effective prices for GPT-5.5 with prompt caching.
| Cache hit rate | Effective blended $/1M | Example request* | vs no cache |
|---|---|---|---|
| 0% | $11.25 | $0.54 | — |
| 50% | $9.56 | $0.315 | −42% |
| 90% | $8.21 | $0.135 | −75% |
*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 | $0.0115 | $11.50 |
| Document summary | 8,000 | 1,000 | $0.07 | $70.00 |
| Codebase question (RAG) | 30,000 | 2,000 | $0.21 | $210.00 |
| Long-context analysis | 150,000 | 5,000 | $0.9 | $900.00 |
Performance
Intelligence Index
54.8
AA composite quality
Coding Index
74.9
Math Index
—
Agentic Index
44.9
Output speed
92 tok/s
median
Time to first token
35.93s
median
Time to first answer
35.93s
after reasoning tokens
Artificial Analysis benchmarks
| Benchmark | Score |
|---|---|
| GPQA Diamond | 93.5% |
| Humanity's Last Exam | 44.3% |
| SciCode | 56.1% |
| IFBench | 75.9% |
| AA-LCR (Long Context Reasoning) | 74.3% |
| Terminal-Bench Hard | 60.6% |
| Terminal-Bench 2.1 | 84.3% |
| τ²-Bench (Telecom) | 93.9% |
| τ³-Bench Banking | 31.3% |
Design Arena Elo
| Category | Elo |
|---|---|
| Website | 1,280 |
| Web apps | 1,171 |
| Full-stack | 1,142 |
| Mobile apps | 1,218 |
| Android native | 1,241 |
| UI components | 1,294 |
| Data viz | 1,293 |
| SVG | 1,273 |
| 3D | 1,250 |
| Game dev | 1,343 |
| Agentic game dev | 1,191 |
| Godot game dev | 1,204 |
| HTML slides | 1,083 |
| PPTX slides | 1,157 |
| Python→PPTX slides | 1,152 |
| Agentic slides | 1,150 |
| Agentic HTML slides | 1,084 |
| Agentic slides (HTML) | 1,077 |
| Agentic slides (Python PPTX) | 1,155 |
| Code categories | 1,284 |
| ASCII art | 1,288 |
Specs
Context window
1.05M
tokens
Max output
128K
tokens
Input modalities
file, image, text
Tokenizer
GPT