AC Ultra 4.8
webparam/ac-ultra-4-8-standardUltra tier — the most capable models on the platform.
Model overview
Input price
$100.00
per 1M tokens
Output price
$400.00
per 1M tokens
Weekly volume
—
tokens / week
Open weights
No
API only
Capabilities
3
of 11 tags
Description
AC Ultra 4.8 is a language model from Webparam. It generates language output and is priced at $100.00 per 1M tokens in and $400.00 per 1M tokens out. That places its input price above the language-category median of $40.00. Webparam’s stated focus is aI infrastructure for South African companies — one account, one wallet, one API key, billed in rand.. The weights are not published, so it is API-only.
Capabilities
- Tool calling
- Calls functions you define and returns their arguments as structured data, the basis of agents.
- JSON mode
- Constrains the response to valid JSON matching a schema you supply.
- Streaming
- Emits tokens as they are generated, so answers appear progressively rather than all at once.
Strengths & weaknesses
Strengths
- Solid throughput — 29.5 tokens/sec measured
- Highest-capability tier Webparam offers
- Tool calling and JSON mode both verified working
Weaknesses
- Streaming is buffered upstream — output arrives in one burst, not incrementally
- Most expensive tier at R400 per million output tokens
Pricing
| Rate | Price | Unit |
|---|---|---|
| Input | $100.00 | per 1M tokens |
| Output | $400.00 | per 1M tokens |
Illustrative placeholder pricing.
Supported features
| Feature | Support |
|---|---|
| Tool calling | Supported |
| JSON mode | Supported |
| Streaming | Supported |
| Vision input | Not supported |
| Audio input | Not supported |
| Long context | Not supported |
| Open weights | Not supported |
| Reasoning | Not supported |
| Fine-tunable | Not supported |
| Batch | Not supported |
| Caching | Not supported |
Example use cases
Complex reasoning
Solid throughput — 29.5 tokens/sec measured
Long-form drafting
Highest-capability tier Webparam offers
Work where a wrong answer is expensive
Tool calling and JSON mode both verified working
Comparison
| Attribute | AC Ultra 4.8 | AC Supreme Safe 5 | AC Ultra 4.6 |
|---|---|---|---|
| Input price | $100.00 | $100.00 | $100.00 |
| Output price | $400.00 | $400.00 | $400.00 |
| Tool calling | Supported | Supported | Supported |
| JSON mode | Supported | Supported | Supported |
| Vision input | Not supported | Not supported | Not supported |
| Open weights | Not supported | Not supported | Not supported |
| Prompt caching | Not supported | Not supported | Not supported |
Best value in each row is highlighted. Illustrative placeholder data.
Provider information
View Webparam →Webparam · Johannesburg, South Africa, South Africa · est. 2026
Webparam aggregates frontier model capacity and resells it through a single OpenAI-compatible endpoint, so a company can reach every model it needs without holding an account, a card and a contract with each vendor.
Recent releases
Documentation
Frequently asked questions
Input is billed at $100.00 per 1M tokens and output at $400.00 per 1M tokens. Every figure on this page is an illustrative placeholder.