Overview

Identity

Identity block not returned by the API for this entity.

Openness

Openness not classified yet — no sourced evidence to place this model in the ontology.

Key facts

Release date: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium
Status: Source:Claude Developer Platform docsT1observed 16 h agohigh
Knowledge cutoff: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium
Deprecation date: Source:Claude Developer Platform docsT1observed 16 h agohigh
Retirement date: Source:Claude Developer Platform docsT1observed 16 h agohigh
Openrouter id: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium

Architecture

Tokenizer: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium

Capabilities

Modalities

Modalities: imagetext
Input: imagetext
Output: text

Capabilities

Tool calling
Yes
OpenRouter public model & pricing listing · T2
Structured output
No
OpenRouter public model & pricing listing · T2
Reasoning
Yes
OpenRouter public model & pricing listing · T2
Vision
Yes
OpenRouter public model & pricing listing · T2
Audio
Unavailable
Fine-tuning available
Unavailable

Context window: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium
Max output: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium
Knowledge cutoff: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium
Tokenizer: Source:OpenRouter public model & pricing listingT2observed 16 h agomedium

Benchmarks1

Compare with another model →

Comparable same task and conditions · Partially comparable same task, conditions differ (effort, temperature, judge) · Not comparable different variant or metric

No benchmark results recorded

Results appear when a tier 1–3 source publishes them; we never copy scores without a source.

Providers & Pricing3

All offers in the price terminal →

Current prices per 1M tokens
Provider	Input / 1M	Output / 1M	Cached in	Batch in / out	Context	Observed	Source
Anthropic APIanthropic/claude-opus-4.1:batch	$7.5	$37.5	$0.75	—	200K	8 h ago	openrouter.aiT2
Anthropic API	$15	$75	$1.5	—	—	16 h ago	platform.claude.comT1
Anthropic APIanthropic/claude-opus-4.1	$15	$75	$1.5	—	200K	8 h ago	openrouter.aiT2

USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.

Price history

Step lines per provider; amber markers are recorded changes. Click a marker or a row for the evidence behind that price.

Output price · USD / 1M tokens 1 provider

Anthropic API

Anthropic API$75 → $37.511 Sept 2026
Anthropic APIfirst observed $7511 Sept 2026

Input price · USD / 1M tokens 1 provider

Anthropic API

Anthropic API$15 → $7.511 Sept 2026
Anthropic APIfirst observed $1511 Sept 2026

Timeline7

Full timeline →

12 Sept 2026
Property changedModelClaude Opus 4.1Anthropic
Claude Opus 4.1: reasoning changed from false to true
ReasoningNo→Yesopenrouter
openrouter.ai
11 Sept 2026
Benchmark resultModelClaude Opus 4.1Anthropic
Claude Opus 4.1 scores 18.57 on Artificial Analysis Intelligence Index
artificial_analysis
artificialanalysis.ai
11 Sept 2026
Property changedModelClaude Opus 4.1Anthropic
Claude Opus 4.1: reasoning changed from true to false
ReasoningYes→Noartificial_analysis
artificialanalysis.ai
11 Sept 2026
Listed by providerModelClaude Opus 4.1Anthropic
Anthropic API lists Claude Opus 4.1 at $7.5 in / $37.5 out per 1M tokens
openrouter
openrouter.ai
11 Sept 2026
Listed by providerModelClaude Opus 4.1Anthropic
Anthropic API lists Claude Opus 4.1 at $15 in / $75 out per 1M tokens
openrouter
openrouter.ai
11 Sept 2026
New modelModelClaude Opus 4.1Anthropic
New model: Claude Opus 4.1 (Anthropic)
anthropic
platform.claude.com
11 Sept 2026
Listed by providerModelClaude Opus 4.1Anthropic
Anthropic API lists Claude Opus 4.1 at $15 in / $75 out per 1M tokens
anthropic
platform.claude.com

Change history26

Temporal, append-only claims: a new observation closes the previous claim instead of overwriting it. Rewind the record with the as-of picker.

Viewing AI Atlas as of 12 Mar 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.

Back to today →

Claude Opus 4.1 was not yet in AI Atlas on 12 Mar 2026

First seen 11 Sept 2026. Nothing is inferred backwards: no attribute is shown for dates before the first observation.

26 claims · 23 properties1 conflicting

Familyfamily1

Claim history for Family
Value	Valid from → to	Status	Source	Confidence	Extractor
Claude	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Release daterelease_date1

Claim history for Release date
Value	Valid from → to	Status	Source	Confidence	Extractor
5 Aug 2025	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Statusstatus2conflicting claims

Claim history for Status
Value	Valid from → to	Status	Source	Confidence	Extractor
deprecated	11 Sept 2026 22:42 UTC → current	conflicting	Artificial AnalysisT2	medium	deterministic
retired	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	conflicted	deterministic

Opennessopenness1

Claim history for Openness
Value	Valid from → to	Status	Source	Confidence	Extractor
proprietary	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Context windowcontext_length1

Claim history for Context window
Value	Valid from → to	Status	Source	Confidence	Extractor
200K tokens	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Max outputmax_output_tokens1

Claim history for Max output
Value	Valid from → to	Status	Source	Confidence	Extractor
32K tokens	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Knowledge cutoffknowledge_cutoff1

Claim history for Knowledge cutoff
Value	Valid from → to	Status	Source	Confidence	Extractor
Jan 2025	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Modalitiesmodalities1

Claim history for Modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
image, text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Input modalitiesmodalities_input1

Claim history for Input modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
image, text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Output modalitiesmodalities_output1

Claim history for Output modalities
Value	Valid from → to	Status	Source	Confidence	Extractor
text	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Tokenizertokenizer1

Claim history for Tokenizer
Value	Valid from → to	Status	Source	Confidence	Extractor
Claude	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Deprecation datedeprecation_date1

Claim history for Deprecation date
Value	Valid from → to	Status	Source	Confidence	Extractor
5 Jun 2026	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Retirement dateretirement_date1

Claim history for Retirement date
Value	Valid from → to	Status	Source	Confidence	Extractor
5 Aug 2026	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Retirement tentativeretirement_tentative1

Claim history for Retirement tentative
Value	Valid from → to	Status	Source	Confidence	Extractor
No	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Availability noteavailability_note1

Claim history for Availability note
Value	Valid from → to	Status	Source	Confidence	Extractor
retired, except on Bedrock and Google Cloud	11 Sept 2026 20:51 UTC → current	current	Claude Developer Platform docsT1	high	deterministic

Descriptiondescription1

Claim history for Description
Value	Valid from → to	Status	Source	Confidence	Extractor
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains...	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

File inputfile_input1

Claim history for File input
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Openrouter idopenrouter_id1

Claim history for Openrouter id
Value	Valid from → to	Status	Source	Confidence	Extractor
anthropic/claude-opus-4.1	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Reasoningreasoning3

Claim history for Reasoning
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	12 Sept 2026 00:05 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic
No	11 Sept 2026 22:42 UTC → 12 Sept 2026 00:05 UTC	superseded	Artificial AnalysisT2	medium	deterministic
Yes	11 Sept 2026 21:10 UTC → 11 Sept 2026 22:42 UTC	superseded	OpenRouter public model & pricing listingT2	medium	deterministic

Structured outputstructured_output1

Claim history for Structured output
Value	Valid from → to	Status	Source	Confidence	Extractor
No	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Supported parameterssupported_parameters1

Claim history for Supported parameters
Value	Valid from → to	Status	Source	Confidence	Extractor
include_reasoning, max_tokens, reasoning, stop, temperature, tool_choice, tools, top_k, top_p	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Tool callingtool_calling1

Claim history for Tool calling
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Visionvision1

Claim history for Vision
Value	Valid from → to	Status	Source	Confidence	Extractor
Yes	11 Sept 2026 21:10 UTC → current	current	OpenRouter public model & pricing listingT2	medium	deterministic

Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →

Provenance

Attributed facts

24

Source tiers

T1T27 / 17

Freshest observation

9 h ago

Conflicts

1 flagged

Source documents 4

Source documents
Source	Document	Type	Tier	Last observed	Snapshots
Claude Developer Platform docs	docs.claude.com/en/docs/about-claude/model-deprecations.md	model_docs	T1· Official	8 h ago	1
Claude Developer Platform docs	docs.claude.com/en/docs/about-claude/pricing.md	pricing	T1· Official	8 h ago	1
OpenRouter public model & pricing listing	openrouter.ai/api/v1/models	catalogue	T2· Quality secondary	8 h ago	6
Artificial Analysis	artificialanalysis.ai/leaderboards/models	leaderboard	T2· Quality secondary	14 h ago	1

Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.

Data quality (63/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →