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
$5.00
Output
$30.00
Cache read
$0.50
Cache write
$2.50
Quality
2 benchmarks · 1 source
Composite
99th
percentile of 344 scored models
Rank
5 / 344
±0.16 sd
Evidence
2 × 1
too little evidence to place with confidence
Effort range
—
one configuration only
reasoning99th1/4 bench
math96th1/7 bench
Every score
one row per source and configuration — nothing averaged away
| Benchmark | Score | Configuration | Source | Run |
|---|---|---|---|---|
| Chess Puzzles | 68.0 ±4.7 | max | Epoch AI | 2026-10-14 |
| 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 7 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 | — |
| kilo | $4.00 | $20.00 | $0.40 | $5.00 | 1.1M | 128K | — |
| openrouter | $4.00 | $20.00 | $0.40 | $5.00 | 1.1M | 128K | — |
| aimlapi | $4.232 | $21.16 | $0.4232 | — | 1.1M | 128K | — |
| 302ai | $5.00 | $30.00 | $0.50 | — | 1.1M | 128K | — |
| prime | $5.00 | $30.00 | — | — | 1.1M | 128K | — |
| kyma · kyma | $5.40 | $27.00 | $0.675 | — | 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 |
| 2026-09-29 | openrouter | Cache read | $0.40 |
| 2026-09-30 | openrouter | Cache read | $0.40 |
| 2026-10-05 | openrouter | Cache read | $0.20 |
| 2026-10-07 | openrouter | Cache read | $0.20 |
| 2026-10-10 | openrouter | Cache read | $0.20 |
| 2026-10-15 | openrouter | Cache read | $0.40 |
| 2026-09-02 | openrouter | Cache write | $2.50 |
| 2026-09-13 | openrouter | Cache write | $2.50 |
| 2026-09-29 | openrouter | Cache write | $5.00 |
| 2026-09-30 | openrouter | Cache write | $5.00 |
| 2026-10-05 | openrouter | Cache write | $2.50 |
| 2026-10-07 | openrouter | Cache write | $2.50 |
| 2026-10-10 | openrouter | Cache write | $2.50 |
| 2026-10-15 | openrouter | Cache write | $5.00 |
| 2026-09-02 | openrouter | Input | $2.00 |
| 2026-09-13 | openrouter | Input | $2.00 |
| 2026-09-29 | openrouter | Input | $4.00 |
| 2026-09-30 | openrouter | Input | $4.00 |
| 2026-10-05 | openrouter | Input | $2.00 |
| 2026-10-07 | openrouter | Input | $2.00 |
| 2026-10-10 | openrouter | Input | $2.00 |
| 2026-10-15 | openrouter | Input | $4.00 |
| 2026-09-02 | openrouter | Output | $10.00 |
| 2026-09-13 | openrouter | Output | $10.00 |
| 2026-09-29 | openrouter | Output | $20.00 |
| 2026-09-30 | openrouter | Output | $20.00 |
| 2026-10-05 | openrouter | Output | $10.00 |
| 2026-10-07 | openrouter | Output | $10.00 |
| 2026-10-10 | openrouter | Output | $10.00 |
| 2026-10-15 | openrouter | Output | $20.00 |
| 2026-10-13 | aimlapi | Cache read | $0.5502 |
| 2026-10-23 | aimlapi | Cache read | $0.4232 |
| 2026-10-13 | aimlapi | Input | $5.5016 |
| 2026-10-23 | aimlapi | Input | $4.232 |
| 2026-10-13 | aimlapi | Output | $27.508 |
| 2026-10-23 | aimlapi | Output | $21.16 |
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