Claude Opus 4.1
Anthropic · released Aug 5, 2025
- Type
- Proprietary
- Input
- $15.00
- Output
- $75.00
- Cached
- $1.50
List price · per 1M tokens · Anthropic at 200K context · source ↗
Our take
Written Aug 3, 2026Claude Opus 4.1 is Anthropic's flagship hosted-only reasoning model with a 200,000-token working memory and measured strengths in coding and instruction following. It accepts text, images and files, but carries a premium price tag with no budget tier available.
Choose this when you need a model whose measured coding skill is the highest in its own suite, or for long-context work with 200,000 tokens of working memory. Use it for enterprise deployments that require file, image and text input in a single proprietary model. Skip it if you need strong maths performance, want to self-host or fine-tune, or if your budget cannot stretch to a premium tier with no cheaper variant.
The case for it
- Coding is the standout skill relative to its own benchmark profile: a 63.5-point gap above its overall text score, the largest positive spread in its skill set.
- Consistently strong at following complex instructions, with its second-highest measured skill in this area.
- Uniformly priced across all six providers, so there is no price arbitrage to hunt.
- Fastest measured throughput on Google Vertex, at 23 tokens per second.
The case against it
- Maths is the weakest skill in its own benchmark suite, with a 68.9-point gap below its coding score and a second run even lower.
- Throughput is highly variable and poor on one major cloud endpoint, an 11.5-fold difference within the same provider family.
- No downloadable weights or fine-tuning access; proprietary and hosted only.
How good is it?
IntelligencePuzzles, maths, exam questions
Arena Text (overall)38th of 143 · 1447.1
Also on this board: 1449.1 via Thinking 16k (Aug 2, 2026). Read the pair, not the higher one.
CodingWriting and fixing code on its own
Arena Coding30th of 143 · 1505.1
Also on this board: 1512.6 via Thinking 16k (Aug 2, 2026). Read the pair, not the higher one.
AgenticPlanning, calling tools, staying on task
Nobody we watch has scored Claude Opus 4.1 for this. We would take the rating from Arena Agent (IPS).
WritingWe do not rate this
Two boards come close and neither tests writing: Arena Creative Writing asks people which of two replies they prefer, and LiveBench Language tests whether a model understood a passage. So we show where Claude Opus 4.1 placed and give it no mark out of five.
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, which is why they get no rating.
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.
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
- $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 |
|---|---|---|---|---|---|---|
| OpenRouter | $15.00 / $75.00 | 200K | not measured | Unknown | Unknown | Unknown |
| Microsoft Azure AIus-east-2 | $15.00 / $75.00 | 200K | 2 tok/s | No | No | Unknown |
| Microsoft Azure AIglobal | $15.00 / $75.00 | 200K | not measured | No | No | Unknown |
| Google Vertex AIglobal | $15.00 / $75.00 | 200K | 23 tok/s | No | No | Confirmed |
| Anthropic | $15.00 / $75.00 | 200K32K out | 16 tok/s | No | Yes30 days | Unknown |
| Amazon Bedrock | $15.00 / $75.00 | 200K | 9 tok/s | No | No | Confirmed |
Microsoft Azure AI
Google Vertex AI
Amazon BedrockAcross the 6 listings we hold: 5 say they do not train on prompts, 0 say they do and 1 do not say. 2 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 | ✓ | ✓ | ✓ |
| Microsoft Azure AIus-east-2 | ✓ | ✓ | ✓ |
| Microsoft Azure AIglobal | ✓ | ✓ | ✓ |
| Google Vertex AIglobal | ✓ | ✗ | ✗ |
| Anthropic | ✓ | ✓ | ✓ |
| Amazon Bedrock | ✓ | ✗ | ✗ |
Tool calling: 6 of 6 listings say yes. JSON output: 4 of 6 listings say yes, 2 say no. Strict schema: 4 of 6 listings say yes, 2 say no.
Models people weigh against Claude Opus 4.1
When we formed this view
Dates behind this page
Prices last checked 9d ago
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 6 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-4-1