Claude Opus 5.5
No shutdown before this date. Claude Opus 5.5 stays on the Claude API until at least Sep 22, 2027.
≥ 11 mo- Earliest retirement
- ≥ 343 daysSep 22, 2027 · Claude API
- Arena Text
- 1,507#2 of 128 · Arena
- GPQA Diamond
- 90.6%#32 of 108 · Epoch AI
- List price · $ per 1M
- $4.00 in $20.00 outClaude API · cached input $0.20
- Context window
- 1MMax output 128K tokens
Dates on every platform
| Platform | Model ID and status | Deprecated | Shuts down | Replacement |
|---|---|---|---|---|
| Claude APIAnthropic: Model deprecations (opens in a new tab) · checked Oct 14, 2026 | claude-opus-5-5Active | – | ≥ 11 moNot sooner than | – |
| Azure AI FoundryMicrosoft: Claude models in Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026 | claude-opus-5-5:1Active | – | None set | – |
| Azure AI FoundryMicrosoft: Claude models in Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026 | claude-opus-5-5:2Active | – | None set | – |
| Amazon BedrockAmazon Web Services: Amazon Bedrock ListFoundationModels, us-east-1 (opens in a new tab) · checked Oct 14, 2026 | anthropic.claude-opus-5-5Active · also au.anthropic.claude-opus-5-5, eu.anthropic.claude-opus-5-5, global.anthropic.claude-opus-5-5, jp.anthropic.claude-opus-5-5, us.anthropic.claude-opus-5-5 | – | ≥ 11 moNot sooner than | – |
| Google Vertex AIGoogle Cloud: Claude Opus 5.5 on Google Cloud (opens in a new tab) · checked Oct 14, 2026 | claude-opus-5-5Active | – | ≥ 11 moNot sooner than | – |
Version 1 runs on Anthropic infrastructure.
Version 2 runs on Azure infrastructure.
In us-east-1, requests go through a cross-Region inference profile (listed in aliases).
What breaks when you move off Claude Opus 5.5
- Parameters
- Parameters
- Defaults
- Tooling
Intelligence
| Benchmark | Publisher | Score | Rank | Published |
|---|---|---|---|---|
| Arena Text | Arena | 1,507 ± 4 | #2 of 128 | Oct 8, 2026 |
| GPQA Diamond | Epoch AI | 90.6% ± 1.9% | #32 of 108 | Sep 22, 2026 |
| Arena WebDev | Arena | 1,813 ± 8 | #1 of 69 | Oct 8, 2026 |
| Arena Agent | Arena | 0 ± 0 | #1 of 35 | Oct 12, 2026 |
| FrontierMath Tier 4 | Epoch AI | 95.0% ± 4.1% | #3 of 58 | Sep 22, 2026 |
| FrontierMath Tiers 1-3 | Epoch AI | 91.2% ± 1.7% | #3 of 71 | Sep 22, 2026 |
| OTIS Mock AIME 2024-2025 | Epoch AI | 100.0% ± 0.0% | #3 of 105 | Sep 22, 2026 |
| SimpleQA Verified | Epoch AI | 72.2% ± 1.4% | #5 of 68 | Sep 22, 2026 |
Arena (arena.ai), https://arena.ai/leaderboard
Epoch AI, ‘Capabilities & benchmarking’. Published online at epoch.ai. Retrieved from ‘https://epoch.ai/benchmarks’ [online resource].
List prices
| Platform | Input | Cached | Output | In effect | Source |
|---|---|---|---|---|---|
Claude APIclaude-opus-5-5 | $4.00 | $0.20 | $20.00 | Sep 22, 2026Current | Anthropic: Pricing (opens in a new tab) |
Amazon Bedrockanthropic.claude-opus-5-5 | $4.40 | $0.22 | $22.00 | Sep 1, 2026Current · Standard tier, in-Region or geographic cross-Region inference, which Bedrock prices 10% above global cross-Region inference. | Amazon Web Services: AWS Price List API: AmazonBedrockFoundationModels, us-east-1 (opens in a new tab) |
Google Vertex AIclaude-opus-5-5 | $4.00 | $0.20 | $20.00 | Sep 22, 2026Current · Global endpoint price; regional and multi-region endpoints cost more. | Google Cloud: Agent Platform pricing (opens in a new tab) |
Change history
ReleaseClaude Opus 5.5 releasedClaude API, Google Vertex AI4 breaks
Anthropic released Claude Opus 5.5 at a lower per-token price than Claude Opus 5. Google Cloud lists the same release date.
- Platform
- Claude API, Google Vertex AI
- Model
- Claude Opus 5.5
- ParametersThinking cannot be disabled: thinking type "disabled" and manual budget_tokens both return a 400 error.
- ParametersForced tool choice (tool_choice "any" or "tool") returns a 400 error.
- DefaultsThe default effort is medium, where Claude Opus 5 defaulted to high. Set effort explicitly.
- ToolingOn the Claude API and Google Cloud, computer use needs the computer_toolset_20260801 toolset; computer_20251124 is rejected.
Source: Anthropic, Claude Opus 5.5 (opens in a new tab); Anthropic, Claude Opus 5.5 migration guide (opens in a new tab); Google Cloud, Claude Opus 5.5 on Google Cloud (opens in a new tab); Google Cloud, Gemini Enterprise Agent Platform release notes (opens in a new tab)
ReleaseClaude Opus 5.5 available on Amazon BedrockAmazon Bedrock
Bedrock added Claude Opus 5.5 as anthropic.claude-opus-5-5.
- Platform
- Amazon Bedrock
- Model
- Claude Opus 5.5
Source: Amazon Web Services, Amazon Bedrock ListFoundationModels, us-east-1 (opens in a new tab)