Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding
Specification
openai listing
Context
1.1M
Max output
128K
Released
2026-04-23
Knowledge cutoff
2025-12-01
Retires
—
Open weights
no
Input
text, image, pdf
Output
text
Price
US dollars per million tokens · openai list price
Input
$30.00
Output
$180.00
Cache read
$30.00
Cache write
$30.00
Batch and priority prices
US dollars per million tokens · per listing
| Price | Listing | $/M |
|---|---|---|
| Batch input | openai | $15.00 |
| Batch output | openai | $90.00 |
Batch input is 50% below the interactive input price at the same listing.
Long-context price tiers
the rate above each context threshold
| Above | Price | $/M |
|---|---|---|
| 272K | Cache read | $6.00 |
| 272K | Input | $60.00 |
| 272K | Output | $270.00 |
Quality
3 benchmarks · 1 source
Composite
97th
percentile of 344 scored models
Rank
12 / 344
±0.11 sd
Evidence
3 × 1
one source, or fewer than 3 benchmarks
Effort range
—
one configuration only
reasoning97th1/4 bench
math96th2/7 bench
Every score
one row per source and configuration — nothing averaged away
| Benchmark | Score | Configuration | Source | Run |
|---|---|---|---|---|
| Chess Puzzles | 62.0 ±4.9 | xhigh | Epoch AI | 2026-10-14 |
| FrontierMath-Tiers-1-3-v2 | 87.7 ±1.9 | xhigh | Epoch AI | 2026-06-12 |
| FrontierMath-Tier-4-v2 | 78.0 ±6.5 | xhigh | Epoch AI | 2026-06-12 |
The leading figure for a benchmark is the median across its configurations, so one heroic high-effort run cannot set the number.
Available from 23 hosts
| Host | In $/M | Out $/M | Cache rd | Cache wr | Context | Output | Retires |
|---|---|---|---|---|---|---|---|
| openaivendor | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| poe | $27.2727 | $163.6364 | — | — | 400K | 128K | — |
| aihubmix | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| aihubmix · aihubmix | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| azure | $30.00 | $180.00 | $3.00 | — | 1.1M | 128K | — |
| cloudflare-ai-gateway | $30.00 | $180.00 | — | — | 1M | 128K | — |
| crossmodel | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| databricks | $30.00 | $180.0001 | $30.00 | $30.00 | 922K | 128K | — |
| edenai | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| fastrouter | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| impossibl | $30.00 | $180.00 | $3.00 | — | 1.1M | 128K | — |
| kilo | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| llmgateway | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| llmgateway-providers | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| neon | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| opencode | $30.00 | $180.00 | $30.00 | — | 1.1M | 128K | — |
| openrouter | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| opper | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| orcarouter | $30.00 | $180.00 | — | — | 1.1M | 100K | — |
| requesty | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| vercel | $30.00 | $180.00 | — | — | 1M | 128K | — |
| zenmux | $30.00 | $180.00 | — | — | 1.1M | 128K | — |
| aimlapi | $31.74 | $190.44 | — | — | 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 | Input | $30.00 |
| 2026-09-06 | openrouter | Input | $30.00 |
| 2026-10-10 | openrouter | Input | $30.00 |
| 2026-09-02 | openrouter | Output | $180.00 |
| 2026-09-06 | openrouter | Output | $180.00 |
| 2026-10-10 | openrouter | Output | $180.00 |
| 2026-09-06 | databricks | Output | $180.00 |
| 2026-10-29 | databricks | Output | $180.0001 |
| 2026-10-13 | aimlapi | Input | $41.262 |
| 2026-10-23 | aimlapi | Input | $31.74 |
| 2026-10-13 | aimlapi | Output | $247.572 |
| 2026-10-23 | aimlapi | Output | $190.44 |
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same model, different key
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