Frontier GPT-5.6 model for complex professional work, coding, and agentic workflows
Specification
most-agreed values
Context
1.1M
Max output
128K
Released
2026-07-09
Knowledge cutoff
2026-02-16
Retires
—
Open weights
no
Input
text, image, pdf
Output
text
Price
US dollars per million tokens · most-agreed
Input
$2.00
Output
$10.00
Cache read
$0.20
Cache write
$2.50
Long-context price tiers
the rate above each context threshold
| Above | Price | $/M |
|---|---|---|
| 272K | Cache read | $0.40 |
| 272K | Input | $4.00 |
| 272K | Output | $15.00 |
Quality
2 benchmarks · 1 source
Composite
100th
percentile of 334 scored models
Rank
1 / 334
±0.17 sd
Evidence
2 × 1
too little evidence to place with confidence
Effort range
—
one configuration only
reasoning100th1/4 bench
math98th1/7 bench
Every score
one row per source and configuration — nothing averaged away
| Benchmark | Score | Configuration | Source | Run |
|---|---|---|---|---|
| Chess Puzzles | 64.0 ±4.8 | max | Epoch AI | 2026-07-10 |
| FrontierMath-Tier-4-v2 | 80.5 ±6.3 | max | Epoch AI | 2026-07-09 |
The leading figure for a benchmark is the median across its configurations, so one heroic high-effort run cannot set the number.
Available from 4 hosts
| Host | In $/M | Out $/M | Cache rd | Cache wr | Context | Output | Retires |
|---|---|---|---|---|---|---|---|
| nano-gpt | $2.00 | $10.00 | $0.20 | $2.50 | 1.1M | 128K | — |
| openrouter | $2.00 | $10.00 | $0.20 | $2.50 | 1.1M | 128K | — |
| kilo | $4.00 | $20.00 | $0.40 | $5.00 | 1.1M | 128K | — |
| 302ai | $5.00 | $30.00 | — | — | 1.1M | 128K | — |
Price history
append-only observations · a listing writes a row only when its price moves
| Date | Host | Field | $/M |
|---|---|---|---|
| 2026-09-02 | openrouter | Cache read | $0.20 |
| 2026-09-13 | openrouter | Cache read | $0.20 |
| 2026-09-02 | openrouter | Cache write | $2.50 |
| 2026-09-13 | openrouter | Cache write | $2.50 |
| 2026-09-02 | openrouter | Input | $2.00 |
| 2026-09-13 | openrouter | Input | $2.00 |
| 2026-09-02 | openrouter | Output | $10.00 |
| 2026-09-13 | openrouter | Output | $10.00 |
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same model, different key
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