Claude Opus 5.5

Language Anthropic Verified Released Sep 22, 2026

Prices

8 offerings · prices as listed

Claude API Global · USD claude-opus-5-5

Conditions/ 1M tokens	Input	Cache read	Cache write		Output
Conditions/ 1M tokens	Input	Cache read	5-minute cache	1-hour cache	Output
Standard	$4.00	$0.20	$5.00	$8.00	$20.00
Batch	$2.00	—	—	—	$10.00

Standard: the price a request with no conditions pays (the headline price elsewhere on the site).

Not stated on Anthropic’s pages: max input, reasoning can be off, max thinking budget, built-in tools, aliases.

From third-party leaderboards, not measured by us

Epoch Capabilities Index 168.4

#3 of 118 listed models · CI 165.5–171.5
LMArena Text 1,506

#4 of 163 listed models · high effort · CI 1,500–1,512 · 14,815 votes
Epoch AI · Chess Puzzles 67%

#3 of 85 listed models · max effort · ±4.73
Epoch AI · EBR-bench 71.4%

#3 of 28 listed models · max effort · ±7.06

Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Oct 28 – Nov 5, 2026
LMArena (Arena), leaderboard-dataset on Hugging Face, licensed CC BY 4.0 · License · as of Nov 8, 2026
EQ-Bench by Samuel J. Paech (eqbench.com; EQ-bench/EQ-bench-site on GitHub), MIT License. · License · as of Oct 24 – 28, 2026
LiveBench (White et al.), release 2026-06-25, livebench.ai, licensed CC BY-SA 4.0. This board, adapted from it, is shared under CC BY-SA 4.0. · License · as of Jun 25, 2026
Terminal-Bench 4.0 leaderboard (Marten, Shaw et al., Terminal-Bench; harbor-framework/terminal-bench on GitHub), licensed Apache-2.0. · License · as of Sep 29, 2026
changes we made

Published by Anthropic, under the conditions it states

Benchmark	Setting	Score
SWE-bench Pro	adaptive thinking, max effort, average of 5 trials	89.9%
SWE-bench Multilingual	adaptive thinking, max effort, average of 5 trials	93.9%
SWE-bench Multimodal	adaptive thinking, max effort, average of 5 trials	61.4%
Terminal-Bench 4.0	adaptive thinking, xhigh effort	66.4%
Humanity's Last Exam	no tools, adaptive thinking, max effort	64.4%
	with tools, adaptive thinking, max effort	67.7%
OSWorld 2.0	partial score, adaptive thinking, max effort	81.8%
	strict score, adaptive thinking, max effort	48.7%

GitHub Copilot Pro+ $39.00 / month

7,000 credits per month
Variable additional usage on top of your base. Flex allotments may change over time.
70 USD of usage per month
GitHub Copilot Max $100.00 / month

20,000 credits per month
Variable additional usage on top of your base. Flex allotments may change over time.
GitHub Copilot Business $19.00 / month

1,900 credits per month
GitHub Copilot Enterprise $39.00 / month

3,900 credits per month
Kiro Pro $20.00 / month

1,000 credits per month
Kiro Pro+ $40.00 / month

2,000 credits per month
Kiro Pro Max $100.00 / month

5,000 credits per month
Kiro Power $200.00 / month

10,000 credits per month

Oct 22, 2026Capability Anthropic adds Opus 5.5 fast mode on Google Cloud Fast mode for Claude Opus 5.5 is now available through Anthropic-managed Claude Models on Google Cloud.
Oct 15, 2026Capability Anthropic makes Opus 5.5 fast mode available on Azure Fast mode for Claude Opus 5.5 is now available in Claude on Microsoft Foundry for deployments hosted on Azure.
Sep 22, 2026Release Anthropic releases Claude Opus 5.5 Anthropic released Claude Opus 5.5 (claude-opus-5-5): 1M context, 128k max output, always-on adaptive thinking, at $4/$20 per MTok (Claude Opus 5 is $5/$25). It is on the Claude API, Amazon Bedrock, AWS, Google Cloud, and Microsoft Foundry.
Sep 22, 2026Capability Anthropic previews fast mode for Claude Opus 5.5 Fast mode is available as a research preview for Claude Opus 5.5 on the Claude API.

Sep 26, 2026 3 new prices on Claude API Cache write (1-hour cache) $8.00 · Input (Batch) $2.00 · Output (Batch) $10.00
Sep 26, 2026 New language model

Anthropic · United States · anthropic.com

Snapshots, the same family and other models from this provider