Claude Fable 5 (Max, Opus 4.8 Fallback)
Anthropic • text#22 of 704 in intelligence
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...
Data source: Artificial Analysis · ID AA: cd55210d-358e-4df1-ba9c-9acb5f186cc9 · Snapshot published: 10/27/2026, 6:00:26 PM · Methodology version: 4.3
Specifications
AA Intelligence Index
49.6
Artificial Analysis · 4.3 · 10/27/2026, 6:00:26 PM
Context Window
1.0M tokens
Input Price/1M
$10.00
#423 of 445
Output Price/1M
$50.00
Parameters
—
Max Output
128K tokens
Cost per Task
$8.746
USD / task · lower is better · Artificial Analysis · 4.3 · 10/27/2026, 6:00:26 PM
Benchmarks
Artificial Analysis metrics for Claude Fable 5 (Max, Opus 4.8 Fallback). Higher is better for capability indexes; lower is better for cost per task.
Agentic
| Benchmark | Score | Maximum | Methodology | Source / version / date |
|---|---|---|---|---|
| AA Agentic Index | 50.7 | 100.0 | Artificial Analysis official API | Artificial Analysis · 4.3 · 10/27/2026 |
Coding
| Benchmark | Score | Maximum | Methodology | Source / version / date |
|---|---|---|---|---|
| AA Coding Index | 76.5 | 100.0 | Artificial Analysis official API | Artificial Analysis · 4.3 · 10/27/2026 |
Cost
| Benchmark | Score | Maximum | Methodology | Source / version / date |
|---|---|---|---|---|
| AA Cost Per Task | 8.7 | 100.0 | Artificial Analysis official API | Artificial Analysis · 4.3 · 10/27/2026 |
overall
| Benchmark | Score | Maximum | Methodology | Source / version / date |
|---|---|---|---|---|
| AA Intelligence Index | 49.6 | 100.0 | Artificial Analysis official API | Artificial Analysis · 4.3 · 10/27/2026 |
Information
- Release date
- June 09, 2026
- Tool Calling
- ✅ Supported
- Vision
- ✅ Supported
- Audio
- ❌ Not supported
Full Analysis: Claude Fable 5 (Max, Opus 4.8 Fallback)
What is Claude Fable 5 (Max, Opus 4.8 Fallback)?
Claude Fable 5 (Max, Opus 4.8 Fallback) is an AI model developed by Anthropic, classified as a text model. It focuses on text processing and natural language generation. As a proprietary model, it is available via Anthropic's cloud API. With a context window of 1.0M tokens, it is suitable for processing long documents such as contracts, books, and complete codebases.
Pricing & Costs in 2026
Claude Fable 5 (Max, Opus 4.8 Fallback) is usage-based, priced at $10/1M input tokens and $50/1M output tokens. For context: 1 million tokens is approximately 750,000 words, or about 10 average-length books. The premium pricing reflects the model's frontier capabilities, recommended for complex reasoning, analysis, and generation tasks where quality takes priority over cost.
Benchmarks & Performance
Claude Fable 5 (Max, Opus 4.8 Fallback) was evaluated on 4 different benchmarks, covering categories like Agentic, Coding, Cost, overall. Results show moderate performance across available evaluations.
It's important to note that benchmarks measure specific aspects and don't capture the full user experience. Factors like instruction adherence, behavior in long conversations, and real-world task quality vary significantly between models and aren't always reflected in standard scores.
Recommended Use Cases
Claude Fable 5 (Max, Opus 4.8 Fallback) specializes in text, offering advanced capabilities for creating and processing text content.
Comparison with Alternatives
In the 2026 AI model ecosystem, Claude Fable 5 (Max, Opus 4.8 Fallback) competes directly with similarly capable models. Key competitors include GPT (OpenAI), Gemini (Google), and open source models like Llama (Meta) and DeepSeek. The choice between models depends on the specific use case, budget, latency requirements, and need for features like multimodality and tool calling.
For a detailed side-by-side comparison, use our comparison tool or check the overall model ranking.
Comparisons with Claude Fable 5 (Max, Opus 4.8 Fallback)
Kimi K3.1 Pro vs Claude Fable 5.1 (max with fallback)
Benchmarks, pricing and speed compared
Claude Fable 5.1 (max with fallback) vs GPT-6 Astra (max)
Benchmarks, pricing and speed compared
Claude Fable 5.1 (max with fallback) vs Gemini 4 Argon (high)
Benchmarks, pricing and speed compared
Claude Fable 5.1 (max with fallback) vs Muse Wonder (max)
Benchmarks, pricing and speed compared
Claude Opus 5.5 (max with fallback) vs Claude Fable 5.1 (max with fallback)
Benchmarks, pricing and speed compared
Frequently Asked Questions
What is Claude Fable 5 (Max, Opus 4.8 Fallback)?
Claude Fable 5 (Max, Opus 4.8 Fallback) is an AI model developed by Anthropic. It is a text model.
How much does Claude Fable 5 (Max, Opus 4.8 Fallback) cost?
Claude Fable 5 (Max, Opus 4.8 Fallback) costs $10/1M input tokens and $50/1M output tokens. For heavy usage (e.g., a chatbot handling 100k messages/month), costs can range from $10 to $1,000 depending on volume.
How does Claude Fable 5 (Max, Opus 4.8 Fallback) compare with other models?
In available benchmarks, Claude Fable 5 (Max, Opus 4.8 Fallback) scored: AA Agentic Index: 50.7/100, AA Coding Index: 76.5/100, AA Cost Per Task: 8.746/100. See the full table above for a detailed comparison.
Is Claude Fable 5 (Max, Opus 4.8 Fallback) open source?
No, Claude Fable 5 (Max, Opus 4.8 Fallback) is a proprietary model from Anthropic. It is available via cloud API. For open source alternatives, check our open source model ranking.
What is Claude Fable 5 (Max, Opus 4.8 Fallback) best for?
Claude Fable 5 (Max, Opus 4.8 Fallback) excels at multimodal tasks including text and vision. With its large context window, it handles long documents, codebases, and extended conversations. It supports tool calling for API integrations and automation.
Last updated: October 27, 2026 • View methodology →