Claude Models 2026: Complete Guide to Anthropic's AI Lineup and Comparison (Opus 4.8, Sonnet 4.5 & Haiku 4)

If you have been following the AI space this year, you know Anthropic has been shipping at an incredible pace. As of June 2026, Claude has grown far beyond just another chatbot. It is a full platform with multiple model tiers, each designed for different kinds of work.

Whether you are a developer trying to pick the right API model, a business leader evaluating enterprise AI, or just someone who wants to understand what Claude can actually do, this guide covers every current Claude model with real specs, pricing, and practical advice.

The Current Claude Lineup

Anthropic currently offers four model tiers, and the naming tells you everything about where each fits. Haiku is the fast one. Sonnet is the everyday workhorse. Opus is the heavy lifter. And Fable 5, released just this month, sits in a class of its own.

Claude Fable 5

Released June 9, 2026, Fable 5 is Anthropic's most capable model ever. It is a Mythos-class system, which means it was built for the kind of work where being right matters more than being fast. We are talking multi-day analysis, complex engineering problems, and long-horizon agentic tasks that require sustained reasoning across thousands of steps.

Here is what matters: Fable 5 has a 1 million token context window and can output up to 128K tokens in a single response. It costs per million input tokens and per million output tokens. That is expensive compared to the other tiers, but for the hardest problems, it can be worth every penny.

One thing to note: demand has been extremely high, and Anthropic has had to manage availability carefully. On subscription plans, Fable 5 was included at no extra cost through June 22, and after that it shifted to usage credits. Check the latest status on Anthropic's pricing page before building anything that depends on it.

Claude Opus 4.8

Opus 4.8 launched May 28, 2026, and it is the model most teams should reach for when they need real capability but cannot justify the Fable 5 price tag. Think of it as the sensible choice for serious work.

Opus 4.8 also has a 1M token context and 128K output, at per million input tokens and per million output tokens. It supports extended thinking, adaptive thinking, and a new effort control feature that lets you dial in how much compute Claude spends on each response. On the coding side, Opus 4.8 introduced dynamic workflows in Claude Code, which allows it to plan and execute hundreds of parallel subagents in a single session for large-scale codebase migrations.

Opus 4.8 also has a fast mode at / per million tokens that runs roughly 2.5x faster. This is three times cheaper than fast mode was on previous Opus versions, which makes it practical for everyday use.

Claude Sonnet 4.6

Sonnet 4.6 is the model I would recommend as the default for most production work. It is fast enough for interactive use, smart enough for the majority of real tasks, and priced so that high volume does not break the bank.

Sonnet 4.6 gives you a 1M token context, 64K output, and costs per million input tokens and per million output tokens. It also supports extended thinking, which Opus and Fable share, making it suitable for tasks that need more reasoning than a simple chat model can provide. For most teams, this is where you start, and you only move up to Opus or Fable when you actually hit a limit.

Claude Haiku 4.5

Haiku 4.5 is the fastest and cheapest Claude model. It has a 200K context window and 64K output, with pricing at per million input tokens and per million output tokens. It is the only Claude model with a smaller context window, but 200K is still enormous for the jobs Haiku is right for.

Use Haiku for high-volume classification, extraction, summarization, customer service triage, and any task where latency and cost matter more than absolute ceiling intelligence. It punches well above its weight for a model in its price range.

How Claude Models Compare

Model	Context	Max Output	Input $/MTok	Output $/MTok	Best For
Fable 5	1M	128K	$10	$50	Hardest reasoning, high-stakes work
Opus 4.8	1M	128K	$5	$25	Agentic coding, deep research
Sonnet 4.6	1M	64K	$3	$15	Everyday production work
Haiku 4.5	200K	64K	$1	$5	Fast, cheap, high-volume tasks

Key Features Across the Lineup

All four models support vision (image input), tool use and function calling, and batch processing. Fable 5 and Opus 4.8 are available on AWS Bedrock, Google Cloud Vertex AI, and Microsoft Azure AI Foundry in addition to the direct Anthropic API.

Extended thinking is available on Opus 4.8 and Sonnet 4.6 (and Fable 5 by default). This allows the model to reason step by step before generating its final response. Adaptive thinking is available on Fable 5 and Opus 4.8, which means the model can dynamically decide how much reasoning is needed based on the task.

If you are using Claude Code, Opus 4.8 is the recommended model for most development work. The dynamic workflows feature lets it break down large tasks into parallel sub-tasks, run them simultaneously, and verify results before reporting back. For day-to-day coding, Sonnet 4.6 provides the best balance of speed and quality.

Choosing the Right Model

Here is the decision framework I use and recommend. Start with Sonnet 4.6. It handles the vast majority of real-world tasks well, and it is fast enough for interactive use. If you hit a reasoning wall or need to process very long documents, move up to Opus 4.8. If the task is critical, high-stakes, and demands the absolute best possible output, reach for Fable 5. Drop to Haiku 4.5 for high-volume, cost-sensitive workloads where latency matters more than peak quality.

If you are building on a budget, the pricing difference between tiers adds up fast. Haiku at / versus Opus at / means a factor of 5 on input and 5 on output. For a pipeline processing millions of tokens daily, that difference is significant.

Legacy Models

A few older models are still active but no longer the recommended versions. Opus 4.7, Opus 4.6, and Opus 4.5 still work through the API but will eventually be retired. Sonnet 4.5 and earlier Sonnet versions are in the same boat. If you are pinning to a specific version for consistency, plan your migration path now. Anthropic typically gives several months of notice before retirement.

The Claude 3.x generation (Haiku 3.5, Sonnet 3.5/3.7, Opus 3) has been fully retired. If you are still using any of these, you need to migrate to the 4.x equivalents.

Bottom Line

Anthropic's Claude lineup in mid-2026 is the clearest it has ever been. Four models, each with a distinct job. Haiku for speed and volume, Sonnet as the default, Opus for hard work, and Fable 5 for the hardest problems. Start with Sonnet, experiment with Opus, save Haiku for the cheap stuff, and only reach for Fable 5 when the answer has to be the best it can possibly be.

The ecosystem around these models has matured too. Claude Code, Cowork, managed agents, scheduled tasks, and the MCP protocol make Claude a platform, not just a model. If you have not tried Claude Code with Opus 4.8 yet, that is where I would start.