Claude Opus 4.8 (Fast)
Anthropic · released May 27, 2026
- Type
- Proprietary
- Input
- $10.00
- Output
- $50.00
- Cached
- $1.00
List price · per 1M tokens · Anthropic at 1M context · source ↗
Our take
Written Aug 2, 2026Claude Opus 4.8 (Fast) is Anthropic's premium reasoning model that can handle up to one million tokens in a single request. It accepts text, images and files, and is available through two channels with identical pricing.
Pick this for long-document analysis or coding tasks that need a one-million-token request limit, or when you want Anthropic's direct API with measured throughput of 89.5 tokens per second. Skip it if you need benchmark-backed quality scores, if you want to self-host, or if you prefer routing through OpenRouter where throughput is unverified in our data.
The case for it
- One-million-token request limit — ten times the 100,000-token scale that was until recently considered frontier-class.
- Measured throughput of 89.5 tokens per second on Anthropic's direct channel.
The case against it
- No benchmark scores in our data, so there is no measured quality data.
- Throughput on the independent channel is unverified in our data, versus the 89.5 tokens per second measured on Anthropic direct.
- Only two tracked offers, so provider choice is narrow.
How good is it?
We hold no score for this model.
We look for every model we track on every board we watch, and none of them has turned up Claude Opus 4.8 (Fast) — so there is no intelligence, coding, agentic or writing score to show you, not a low one, none.
Or rent it from someone else
Why this differs from the header. The strip above quotes Anthropic's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $10.00 in / $50.00 out
- Context served
- 1M
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouter | $10.00 / $50.00 | 1M | not measured | Unknown | Unknown | Unknown |
| Anthropic | $10.00 / $50.00 | 1M | 136 tok/s | No | Yes30 days | Unknown |
Across the 2 listings we hold: 1 say they do not train on prompts, 0 say they do and 1 do not say. 0 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouter | ✓ | ✓ | ✓ |
| Anthropic | ✓ | ✓ | ✓ |
Tool calling: 2 of 2 listings say yes. JSON output: 2 of 2 listings say yes. Strict schema: 2 of 2 listings say yes.
Models people weigh against Claude Opus 4.8 (Fast)
When we formed this view
Dates behind this page
Prices last checked 9d ago
What we do not know about this model yet
- No board we watch has turned up a score, so we hold no quality figures at all.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 2 listings do not say whether they train on prompts.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.
Identifiers
- Modality record
- text+image+file->text
- Catalogue slug
- anthropic-claude-opus-4-8-fast