Model Tracker

Claude Opus 4.6

Claude Opus 4.6 is an AI model made by Anthropic. Anthropic released it on 5 February 2026. It is generally available. It takes text, image and returns text.

Anthropic

Claude Opus 4.6 is an AI model made by Anthropic. Anthropic released it on 5 February 2026. It is generally available. It takes text, image and returns text. Its context window is 1,000,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $5.00 per 1M tokens for input and $25.00 per 1M tokens for output. Its knowledge cutoff is May 2025.

Released: 5 February 2026 — platform.claude.com, read 16 October 2026
Status: Generally available — platform.claude.com, read 16 October 2026
Takes: Text, Image — platform.claude.com, read 16 October 2026
Returns: Text — platform.claude.com, read 16 October 2026
Open weights: Not confirmed: The maker's pages reviewed do not state whether the model's weights are open or downloadable.
Licence: Not confirmed: The maker's pages reviewed do not state a licence for this model.
Context window: 1,000,000 tokens — platform.claude.com, read 16 October 2026
Longest answer: 128,000 tokens — platform.claude.com, read 16 October 2026
Knowledge cutoff: May 2025 — platform.claude.com, read 16 October 2026
API price, input: $5.00 per 1M tokens — claude.com, read 16 October 2026
API price, output: $25.00 per 1M tokens — claude.com, read 16 October 2026
Where: API, Consumer app, Cloud marketplaces — www.anthropic.com, read 16 October 2026
Parameters: Not confirmed: The maker's pages reviewed do not publish a parameter count for this model.
Model card: Not confirmed: two readings disagree: https://www-cdn.anthropic.com/14e4fb01875d2a69f646fa5e574dea2b1c0ff7b5.pdf and https://www.anthropic.com/claude-opus-4-6-system-card

Benchmarks

Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.

Arena

Text Arena, Claude Opus 4.6 (High): 1,503 (1,500–1,506, 81,394 votes), published 15 October 2026
Text Arena, Claude Opus 4.6: 1,497 (1,494–1,500, 86,071 votes), published 15 October 2026
Code Arena (WebDev), Claude Opus 4.6 (High): 1,547 (1,541–1,552, 19,380 votes), published 18 October 2026
Code Arena (WebDev), Claude Opus 4.6: 1,537 (1,532–1,543, 20,642 votes), published 18 October 2026
Vision Arena, claude-opus-4-6-high: 1,299 (1,293–1,306, 22,304 votes), published 9 October 2026
Vision Arena, claude-opus-4-6: 1,294 (1,288–1,301, 26,853 votes), published 9 October 2026

Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0

Epoch AI

Epoch Capabilities Index, Claude Opus 4.6: 155.3 (153.6–157.1), as of 19 October 2026
GPQA Diamond, claude-opus-4-6_32K: 90.5% (± 1.7), run 6 February 2026
GPQA Diamond, claude-opus-4-6_64K: 88.8% (± 1.9), run 6 February 2026
GPQA Diamond, claude-opus-4-6_max: 88.4% (± 2.3), run 6 August 2026
FrontierMath, tiers 1–3, claude-opus-4-6_max: 66.0% (± 2.8), run 11 June 2026
FrontierMath, tier 4, claude-opus-4-6_max: 26.8% (± 7.0), run 11 June 2026
SWE-bench Verified, claude-opus-4-6: 78.7% (± 1.9), run 18 February 2026
OTIS Mock AIME 2024–2025, claude-opus-4-6_64K: 94.4% (± 2.8), run 6 February 2026
OTIS Mock AIME 2024–2025, claude-opus-4-6_32K: 93.1% (± 3.3), run 6 February 2026
OTIS Mock AIME 2024–2025, claude-opus-4-6_max: 91.1% (± 4.3), run 6 August 2026
SimpleQA Verified, claude-opus-4-6_max: 47.0% (± 1.6), run 27 August 2026

Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0

Questions

When was Claude Opus 4.6 released?

Anthropic released Claude Opus 4.6 on 5 February 2026.

Is Claude Opus 4.6 still available?

Yes: it is generally available, as Anthropic states it.

What is the context window of Claude Opus 4.6?

The context window of Claude Opus 4.6 is 1,000,000 tokens, as Anthropic prints it.

How much does the Claude Opus 4.6 API cost?

On the standard tier, Claude Opus 4.6 costs $5.00 per 1M tokens for input and $25.00 per 1M tokens for output, as Anthropic lists it.

What does Claude Opus 4.6 take and return?

Claude Opus 4.6 takes text, image and returns text.

What is the knowledge cutoff of Claude Opus 4.6?

The knowledge cutoff of Claude Opus 4.6 is May 2025.

Sources

Claude Opus 4.6 (read 16 October 2026)
Introducing Claude Opus 4.6 (read 16 October 2026)
Pricing (read 16 October 2026)
Model system cards (read 16 October 2026)
Claude Opus 4.6 System Card (read 16 October 2026)

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