Author's Description
Claude 2 delivers advancements in key capabilities for enterprises—including an industry-leading 200K token context window, significant reductions in rates of model hallucination, system prompts and a new beta feature: tool use.
Key Specifications
Supported Parameters
This model supports the following parameters:
Performance Summary
Anthropic's Claude v2.1, released on November 21, 2023, demonstrates a strong focus on reliability and an impressive context window. The model exhibits exceptional reliability, achieving a 98% success rate across benchmarks, indicating minimal technical failures and consistent response delivery. However, its speed performance is moderate, ranking in the 32nd percentile, suggesting it is not among the fastest models available. Pricing for Claude v2.1 tends to be at premium levels, positioned in the 7th percentile for cost-effectiveness. In terms of benchmark performance, Claude v2.1 shows varied capabilities. It achieved 91.0% accuracy in General Knowledge and 96.0% in Ethics, placing it in the 32nd and 29th percentiles respectively, indicating solid but not top-tier performance in these areas. Its Email Classification accuracy was 93.0% (22nd percentile). A notable weakness appears in Coding, where it scored 67.0% accuracy, placing it in the 28th percentile. Key strengths include its high reliability and the industry-leading 200K token context window, which is beneficial for complex, long-form tasks. Its primary weakness lies in its premium pricing and moderate speed, which might be a consideration for cost-sensitive or time-critical applications.
Model Pricing
Current Pricing
| Feature | Price (per 1M tokens) |
|---|---|
| Prompt | $8 |
| Completion | $24 |
Price History
Available Endpoints
| Provider | Endpoint Name | Context Length | Pricing (Input) | Pricing (Output) |
|---|---|---|---|---|
|
Anthropic
|
Anthropic | anthropic/claude-2.1 | 200K | $8 / 1M tokens | $24 / 1M tokens |
Benchmark Results
| Benchmark | Category | Reasoning | Strategy | Free | Executions | Accuracy | Cost | Duration |
|---|
Other Models by anthropic
|
|
Released | Params | Context |
|
Speed | Ability | Cost |
|---|---|---|---|---|---|---|---|
| Anthropic: Claude Opus 4.5 | Nov 24, 2025 | — | 200K |
Image input
Text input
File input
Text output
|
★★★ | ★★★★★ | +$$$$$ |
| Anthropic: Claude Haiku 4.5 | Oct 15, 2025 | — | 200K |
Image input
Text input
Text output
|
★★★★ | ★★★★ | $$$$$ |
| Anthropic: Claude Haiku 4.5 Unavailable | Oct 14, 2025 | — | 200K |
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Text input
Text output
|
— | — | $$$$$ |
| Anthropic: Claude Sonnet 4.5 | Sep 29, 2025 | — | 1M |
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Text input
File input
Text output
|
★★ | ★★★★★ | $$$$$ |
| Anthropic: Claude Opus 4.1 | Aug 05, 2025 | — | 200K |
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Text input
File input
Text output
|
★★ | ★★★★★ | +$$$$$ |
| Anthropic: Claude Opus 4 | May 22, 2025 | — | 200K |
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Text input
File input
Text output
|
★★ | ★★★★★ | +$$$$$ |
| Anthropic: Claude Sonnet 4 | May 22, 2025 | — | 1M |
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File input
Text output
|
★★★ | ★★★★★ | $$$$$ |
| Anthropic: Claude 3.7 Sonnet | Feb 24, 2025 | — | 200K |
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File input
Text output
|
★★★ | ★★★★★ | $$$$$ |
| Anthropic: Claude 3.5 Haiku | Nov 03, 2024 | — | 200K |
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Text input
Text output
|
★★★★ | ★★★ | $$$$ |
| Anthropic: Claude 3.5 Haiku (2024-10-22) | Nov 03, 2024 | — | 200K |
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Text input
File input
Text output
|
★★★★ | ★★★ | $$$$ |
| Anthropic: Claude 3.5 Sonnet | Oct 21, 2024 | ~400B | 200K |
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Text input
File input
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|
★★★ | ★★★★ | +$$$$$ |
| Anthropic: Claude 3.5 Sonnet (2024-06-20) Unavailable | Jun 19, 2024 | ~400B | 200K |
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Text input
File input
Text output
|
★★★★ | ★★★★ | $$$$$ |
| Anthropic: Claude 3 Haiku | Mar 12, 2024 | ~20B | 200K |
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Text output
|
★★★★★ | ★★★ | $$$ |
| Anthropic: Claude 3 Sonnet Unavailable | Mar 04, 2024 | ~200B | 200K |
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|
★★★★ | ★★★★ | $$$$$ |
| Anthropic: Claude 3 Opus | Mar 04, 2024 | ~2T | 200K |
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Text output
|
★★★ | ★★★★ | +$$$$$ |
| Anthropic: Claude v2 Unavailable | Nov 21, 2023 | 137B | 200K |
Text input
Text output
|
★★ | ★★★★ | +$$$$$ |
| Anthropic: Claude v2.0 Unavailable | Jul 27, 2023 | 137B | 100K |
Text input
Text output
|
★★★ | ★★★★ | +$$$$$ |