AI model comparison
Muse Spark 1.3 vs Claude Fable 5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Meta
Muse Spark 1.3
Muse Spark 1.3 is a multimodal reasoning model from Meta for long-running agentic, multi-agent, and coding workflows.
- Input / 1M
- $1.25
- Output / 1M
- $4.25
- Context
- 1.05M
Anthropic
Claude Fable 5
Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.
- Input / 1M
- $10
- Output / 1M
- $50
- Context
- 1M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Muse Spark 1.3
9.7x cheaper for a typical chat
Higher intelligence score
Claude Fable 5
49.6 vs 48.1 on Artificial Analysis
Larger context window
Muse Spark 1.3
1.05M vs 1M tokens
Newer release
Muse Spark 1.3
Released September 2, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Fable 549.6Coding index
Claude Fable 576.5Agentic index
Claude Fable 550.7Pricing
Muse Spark 1.3 vs Claude Fable 5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Fable 5 | |
|---|---|---|
| Input tokensPer 1M tokens | $1.25 | $10 |
| Output tokensPer 1M tokens | $4.25 | $50 |
| Cached input (read)Per 1M tokens | $0.15 | $1 |
| Cache writePer 1M tokens | Not available | $12.50 |
| Web searchPer request | $0.0025 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Claude Fable 5$45Coding task
30K in, 4K out
Claude Fable 5$500$230 cachedLong document summary
150K in, 2K out
Claude Fable 5$1600$250 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Fable 5 | |
|---|---|---|
| Context window | 1.05M tokens | 1M tokens |
| Max output | 944K tokens | 128K tokens |
| Input types | File, Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, Extra high, High, Medium, Low, Minimal | Max, Extra high, High, Medium, Low |
| Default reasoning effort | Medium | High |
| Release date | September 2, 2026 | June 9, 2026 |
Features
Supported features
API features available for each model.
| Metric | Claude Fable 5 | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Not supported | Supported |
| Deterministic seed | Not supported | Not supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Muse Spark 1.3 vs Claude Opus 5.5
- Muse Spark 1.3 vs Claude Sonnet 5.5
- Muse Spark 1.3 vs Claude Fable 5.1
- Muse Spark 1.3 vs GPT-6 Astra
- Muse Spark 1.3 vs GPT-6.1 Sol
- Muse Spark 1.3 vs Claude Opus 5
- Muse Spark 1.3 vs GPT-6 Sol
- Muse Spark 1.3 vs GPT-5.6 Sol
- Muse Spark 1.3 vs Grok 4.7
- Muse Spark 1.3 vs MiMo-V2.6-Pro
- Muse Spark 1.3 vs Qwen3.8 Max (0902)
- Muse Spark 1.3 vs GLM 5.3
- Muse Spark 1.3 vs Grok 4.6
- Muse Spark 1.3 vs Gemini 3.8 Flash
- Muse Spark 1.3 vs DeepSeek V4.1 Flash
Claude Fable 5View full model details- Claude Fable 5 vs Claude Opus 5.5
- Claude Fable 5 vs Claude Sonnet 5.5
- Claude Fable 5 vs Claude Fable 5.1
- Claude Fable 5 vs GPT-6 Astra
- Claude Fable 5 vs GPT-6.1 Sol
- Claude Fable 5 vs Claude Opus 5
- Claude Fable 5 vs GPT-6 Sol
- Claude Fable 5 vs GPT-5.6 Sol
- Claude Fable 5 vs Kimi K3
- Claude Fable 5 vs Claude Opus 4.8
Our take
Muse Spark 1.3 is 9.7x cheaper for a typical chat. Claude Fable 5 scores higher on the Artificial Analysis Intelligence Index (49.6 vs 48.1). Muse Spark 1.3 has the larger context window (1.05M vs 1M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Muse Spark 1.3 or Claude Fable 5 cheaper?
Muse Spark 1.3 is cheaper for a typical chat (2K input tokens and 500 output tokens). Muse Spark 1.3 costs $1.25 per 1M input tokens and $4.25 per 1M output tokens, while Claude Fable 5 costs $10 per 1M input tokens and $50 per 1M output tokens.
Which has a bigger context window, Muse Spark 1.3 or Claude Fable 5?
Muse Spark 1.3 supports up to 1.05M tokens of context, compared with 1M for Claude Fable 5.
Is Muse Spark 1.3 smarter than Claude Fable 5?
On the Artificial Analysis Intelligence Index, Muse Spark 1.3 scores 48.1 and Claude Fable 5 scores 49.6, putting Claude Fable 5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Muse Spark 1.3 and Claude Fable 5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Muse Spark 1.3 and Claude Fable 5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Muse Spark 1.3 and Claude Fable 5 at the same time. Compare the answers side by side and keep the best one.