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Anthropic

Anthropic API and models: 14 models on Impossibl, including Claude Haiku 5.5, Claude Sonnet 5.5, and Claude Opus 5.5. Compare pricing per million tokens, context windows, and capabilities between different Anthropic models.

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models

modalities · in → out

latest release

Claude Haiku 5.5Oct 7, 2026

model

Claude Haiku 5.5
anthropic/claude-haiku-5-5
Claude Haiku 5.5 is Anthropic's fastest and cheapest Claude, built for high-volume, latency-sensitive work such as classification, routing, extraction and subagent tasks.
AnthropicText generationimage input
context
1mtokens
input price
$0.10/1m tokens
output price
$0.50/1m tokens
released
oct 7, 2026
Claude Sonnet 5.5
anthropic/claude-sonnet-5-5
Claude Sonnet 5.5 is Anthropic's Sonnet-tier model and the direct successor to Claude Sonnet 5, sitting between Haiku and Opus as the family's balance of speed and intelligence.
AnthropicText generationimage input
context
1mtokens
input price
$2.00/1m tokens
output price
$10.00/1m tokens
released
sep 28, 2026
Claude Opus 5.5
anthropic/claude-opus-5-5
Claude Opus 5.5 is Anthropic's flagship Opus-tier model and the first release in the Claude 5.5 family, built for long-running agentic coding and knowledge work.
AnthropicText generationimage input
context
1mtokens
input price
$4.00/1m tokens
output price
$20.00/1m tokens
released
sep 22, 2026
Claude Fable 5.1
anthropic/claude-fable-5-1
Claude Fable 5.1 is Anthropic's flagship Mythos-level model, above the Opus, Sonnet, and Haiku tiers, built for long-running agentic and whole-codebase work.
AnthropicText generationimage input
context
1mtokens
input price
$10.00/1m tokens
output price
$50.00/1m tokens
released
sep 1, 2026
Claude Opus 5
anthropic/claude-opus-5
Claude Opus 5 is Anthropic's Opus-tier model, frontier intelligence below Claude Fable 5 for everyday professional work in engineering, research, and automation.
AnthropicText generationimage input
context
1mtokens
input price
$5.00/1m tokens
output price
$25.00/1m tokens
released
jul 24, 2026
Claude Sonnet 5
anthropic/claude-sonnet-5
Claude Sonnet 5 is Anthropic's mid-tier Sonnet model, positioned for multi-step coding, business automation, legal research, and computer-use agents at lower cost than Opus.
AnthropicText generationimage input
context
1mtokens
input price
$2.00/1m tokens
output price
$10.00/1m tokens
released
jun 30, 2026
Claude Fable 5
anthropic/claude-fable-5
Claude Fable 5 is Anthropic's first generally available Mythos-class model, built for autonomous coding, research, and long-horizon agentic work.
AnthropicText generationimage input
context
1mtokens
input price
$10.00/1m tokens
output price
$50.00/1m tokens
released
jun 9, 2026
Claude Opus 4.8
anthropic/claude-opus-4-8
Claude Opus 4.8 is an Opus-tier model from Anthropic aimed at agentic coding, legal and financial document work, and complex multi-step reasoning in enterprise workflows.
AnthropicText generationimage input
context
1mtokens
input price
$5.00/1m tokens
output price
$25.00/1m tokens
released
may 28, 2026
Claude Opus 4.7
anthropic/claude-opus-4-7
Claude Opus 4.7 is an Opus-tier model from Anthropic built for demanding software engineering, long-running agents, and vision-heavy tasks like computer use.
AnthropicText generationimage input
context
1mtokens
input price
$5.00/1m tokens
output price
$25.00/1m tokens
released
apr 16, 2026
Claude Sonnet 4.6
anthropic/claude-sonnet-4-6
Claude Sonnet 4.6 is Anthropic's mid-tier Sonnet model for coding, computer use, document comprehension, and office automation.
AnthropicText generationimage input
context
1mtokens
input price
$3.00/1m tokens
output price
$15.00/1m tokens
released
feb 17, 2026
Claude Opus 4.6
anthropic/claude-opus-4-6
Claude Opus 4.6 is an Opus-tier model from Anthropic built for agentic coding, large-codebase navigation, financial and research work, and long-horizon planning.
AnthropicText generationimage input
context
1mtokens
input price
$5.00/1m tokens
output price
$25.00/1m tokens
released
feb 5, 2026
Claude Opus 4.5
anthropic/claude-opus-4-5
Claude Opus 4.5 is an Opus-tier model from Anthropic positioned for coding, long-horizon agents, computer use, and deep research.
AnthropicText generationimage input
context
200ktokens
input price
$5.00/1m tokens
output price
$25.00/1m tokens
released
nov 24, 2025
Claude Haiku 4.5
anthropic/claude-haiku-4-5
Claude Haiku 4.5 is Anthropic's small, fast model, built for real-time chat assistants, pair programming, and cost-sensitive workloads where responsiveness matters.
AnthropicText generationimage input
context
200ktokens
input price
$1.00/1m tokens
output price
$5.00/1m tokens
released
oct 15, 2025
Claude Sonnet 4.5
anthropic/claude-sonnet-4-5
Claude Sonnet 4.5 is Anthropic's mid-tier Sonnet model, positioned for real-world coding, building complex agents, and computer use across browsers and spreadsheets.
AnthropicText generationimage input
context
200ktokens
input price
$3.00/1m tokens
output price
$15.00/1m tokens
released
sep 29, 2025

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 Claude models are available through Impossibl?

The directory lists 14 models from Anthropic available through the Impossibl API, including Claude Haiku 5.5, Claude Sonnet 5.5, and Claude Opus 5.5. Open each model page for its API identifier, capabilities, and current pricing.

How much do Claude 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 $0.10 per million input tokens. Published output rates start at $0.50 per million output tokens. Input and output minima may refer to different models. Long-context tiers can change prices for the whole request; check each model's thresholds and rates. Individual model pages include published cache prices and billing units. Applicable fees and workspace-specific pricing can affect the amount paid.

What is the cheapest Claude model?

By published input rate, the cheapest Claude text generation model on Impossibl is Claude Haiku 5.5 (anthropic/claude-haiku-5-5) at $0.10 per million input tokens and $0.50 per million output tokens. Cheapest by input rate is not always cheapest for a workload; output-heavy or cached requests can favor another model.

Does Impossibl add a markup to Anthropic pricing?

No. Usage is charged at the provider's list price with 0% usage markup. Prepaid credit purchases include a 5% platform fee, and there is no subscription. The rates on this page are Anthropic's published base rates, and usage comes off your balance when the request finishes.

What context windows do Claude 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 Haiku 5.5. Context limits vary by model and are separate from maximum output limits.

What inputs and capabilities do Claude 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 14 models.

How do I use Claude models through an API?

Use the exact model identifier from the model page with the Impossibl API. For example, select anthropic/claude-haiku-5-5 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.