Claude Opus 4.1
Anthropic · released Aug 5, 2025
- Type
- Closed
- Input
- $15.00
- Output
- $75.00
- Cached
- $1.50
List price · per 1M tokens · Anthropic at 200K context · machine-readable source ↗
Our take
Written Sep 17, 2026Claude Opus 4.1 is a hosted-only model from Anthropic: we list no download for it, so using it means choosing a host, and every listed offer carries the same premium rate. Its evidence is human-preference arena ratings rather than correctness benchmarks, so treat it as a strong candidate to trial on work you can check.
Reach for it on coding and hard-prompt work where you want a strong human-preference rating and are willing to pay a premium hosted rate, or when your questions arrive with images or files attached. Its 200,000-token request capacity means a long report or a stack of documents need not be split up first. Skip it if you need to run the model yourself, or if you need measured correctness on maths or code rather than preference votes.
The case for it
- Among the stronger arena ratings we list on coding and hard prompts, both from human pairwise votes rather than a correctness rubric, so they reflect which answer people preferred, not whether it was right.
- Text, image and file input with text output, so a screenshot or a document does not have to be transcribed first.
- A 200,000-token request capacity takes a long report or a stack of documents beside the question, though room to hold it is not a guarantee of accurate recall.
The case against it
- Maths and web-app building sit among its lower arena ratings, and both are preference votes rather than accuracy measures, so neither tells you whether the answer was correct.
- Every listed offer carries the same premium rate, so there is no lower-cost host to fall back on.
- We list no download for it, so running it yourself is not a route we can point to, and the parameter count is not disclosed.
How good is it?
A closed text model from Anthropic built for drafting and prose work.
- drafts, rewrites and editingArena Creative Writing · 35th of 168
EverydayGeneral questions and everyday reasoning
Arena Text (overall)51st of 168 · 1448
Also on this board: 1450 (Sep 25, 2026). Read the pair, not the higher one.
CodingWriting and fixing code on its own
Arena Coding44th of 168 · 1505
Also on this board: 1511 (Sep 25, 2026). Read the pair, not the higher one.
AgenticPlanning, calling tools, staying on task
Not yet scored on Arena Agent.
WritingDrafting and rewriting prose
Arena Creative Writing35th of 168 · 1442
Arena Creative Writing is the only board that has scored it for this.
Also on this board: 1445 (Sep 25, 2026). Read the pair, not the higher one.
These tests check whether a model follows instructions — a precondition for all the work above, but not a measure of how well that work is done.
Every published score for this model7 scoresEvery figure we hold, from 7 boards, with who ran it and a link to the source — including the boards no rating above is built on.
Where to rent it
Prices checked between 59 min and 9 days ago — each listing carries its own date.
Anthropic, direct
The lab is also the cheapest we hold. The strip above and this offer are the same one, so nothing on this page undercuts Anthropic on 200K of context.
- per 1M tokens
- $15.00 in / $75.00 out
- Context served
- 200K
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouterOpenRouter's own listing | $15.00 / $75.00checked 60 min ago | 200K | not measured | Unknown | Unknown | Unknown |
| AnthropicDirect | $15.00 / $75.00checked 9 days ago | 200K32K max reply | not measured | No | Yes30 days | Unknown |
| Amazon BedrockThrough OpenRouter | $15.00 / $75.00checked 59 min ago | 200K32K max reply | 12 tok/s | No | No | Confirmed |
OpenRouter
Amazon BedrockAcross the 3 listings we hold: 2 say they do not train on prompts, 0 say they do and 1 does not say. 1 appears in the zero-retention registry we check; the rest are unknown to us.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouterOpenRouter's own listing | ✓ | ✗ | ✗ |
| AnthropicDirect | ✓ | ✓ | ✓ |
| Amazon BedrockThrough OpenRouter | ✓ | ✗ | ✗ |
Tool calling: 3 of 3 listings say yes. JSON output: 1 of 3 listings says yes, 2 say no. Strict schema: 1 of 3 listings says yes, 2 say no.
Models people weigh against Claude Opus 4.1
When we formed this view
Recent changes
What moved
first indexed by our pipelineEach date is the day we first saw the change, or the day the maker announced it.
What we do not know about this model yet
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 1 of 3 listings does not say whether it trains on prompts.
- We hold no batch or off-peak rate for any of its listings.
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
We hold no licence record for this model, and no record of published weights either — so we can neither summarise its terms nor point you at the weights.
Identifiers
- Takes in, gives back
- Text, images and documents in, text out
- Catalogue slug
- anthropic-claude-opus-4-1