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Anthropic models.
Access 11 models from Anthropic through the Impossibl API, including Claude Fable 5, Claude Fable 5.1, and Claude Haiku 4.5. Compare API pricing, context windows, and capabilities.
filter by model type, supported inputs, and context window. select two or three models to compare specifications and estimate the same workload.
- Claude Fable 5
anthropic/claude-fable-5
Claude Fable 5 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $10.00 per million input tokens. The advertised output rate is $50.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $10.00/1m tokens
- output price
- $50.00/1m tokens
- Claude Fable 5.1
anthropic/claude-fable-5-1
Claude Fable 5.1 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $10.00 per million input tokens. The advertised output rate is $50.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $10.00/1m tokens
- output price
- $50.00/1m tokens
- Claude Haiku 4.5
anthropic/claude-haiku-4-5
Claude Haiku 4.5 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $1.00 per million input tokens. The advertised output rate is $5.00 per million output tokens.
AnthropicText generationimage input
- context
- 200ktokens
- input price
- $1.00/1m tokens
- output price
- $5.00/1m tokens
- Claude Opus 4.5
anthropic/claude-opus-4-5
Claude Opus 4.5 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $25.00 per million output tokens.
AnthropicText generationimage input
- context
- 200ktokens
- input price
- $5.00/1m tokens
- output price
- $25.00/1m tokens
- Claude Opus 4.6
anthropic/claude-opus-4-6
Claude Opus 4.6 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $25.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $5.00/1m tokens
- output price
- $25.00/1m tokens
- Claude Opus 4.7
anthropic/claude-opus-4-7
Claude Opus 4.7 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $25.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $5.00/1m tokens
- output price
- $25.00/1m tokens
- Claude Opus 4.8
anthropic/claude-opus-4-8
Claude Opus 4.8 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $25.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $5.00/1m tokens
- output price
- $25.00/1m tokens
- Claude Opus 5
anthropic/claude-opus-5
Claude Opus 5 is an Anthropic reasoning model designed for complex software development, extended agent tasks, and professional analysis. It uses adaptive thinking to adjust reasoning effort to the task. Its published context window is 1,000,000 tokens. The advertised input rate is $5.00 per million input tokens. The advertised output rate is $25.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $5.00/1m tokens
- output price
- $25.00/1m tokens
- Claude Sonnet 4.5
anthropic/claude-sonnet-4-5
Claude Sonnet 4.5 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 200,000 tokens. The advertised input rate is $3.00 per million input tokens. The advertised output rate is $15.00 per million output tokens.
AnthropicText generationimage input
- context
- 200ktokens
- input price
- $3.00/1m tokens
- output price
- $15.00/1m tokens
- Claude Sonnet 4.6
anthropic/claude-sonnet-4-6
Claude Sonnet 4.6 is an Anthropic model built for coding, computer use, document analysis, and agent planning. It expands on Sonnet 4.5 with improvements in instruction following and reasoning across long inputs. Its published context window is 1,000,000 tokens. The advertised input rate is $3.00 per million input tokens. The advertised output rate is $15.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $3.00/1m tokens
- output price
- $15.00/1m tokens
- Claude Sonnet 5
anthropic/claude-sonnet-5
Claude Sonnet 5 is a text generation model from Anthropic, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $2.00 per million input tokens. The advertised output rate is $10.00 per million output tokens.
AnthropicText generationimage input
- context
- 1mtokens
- input price
- $2.00/1m tokens
- output price
- $10.00/1m tokens
compare Anthropic models
compare models with the same model type and billing unit. each comparison includes published api prices, context limits, and capabilities.
frequently asked questions
Which Anthropic models are available through Impossibl?
The directory lists 11 models from Anthropic available through the Impossibl API, including Claude Fable 5, Claude Fable 5.1, and Claude Haiku 4.5. Open each model page for its API identifier, capabilities, and current pricing.
How much do Anthropic models cost?
Anthropic model prices vary by model and usage. All rates below are published base API rates in USD. For token-priced models, published input rates start at $1.00 per million input tokens. Published output rates start at $5.00 per million output tokens. Input and output minima may refer to different models. Individual model pages include published cache prices and billing units. Applicable fees and workspace-specific pricing can affect the amount paid.
What context windows do Anthropic models support?
Among Anthropic models with a published limit on Impossibl, the largest context window is 1,000,000 tokens, listed for Claude Fable 5, Claude Fable 5.1, and Claude Opus 4.6. Context limits vary by model and are separate from maximum output limits.
What inputs and capabilities do Anthropic models support?
Available model types include text generation. Published input support includes image and text; support varies by model. Tool-calling support is unspecified for 11 models.
How do I use Anthropic models through an API?
Use the exact model identifier from the model page with the Impossibl API. For example, select anthropic/claude-fable-5 with /v1/chat/completions. Endpoint compatibility depends on the selected model. The API quickstart explains how to create an API key and send a request.