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Claude Fable 5 vs Solar Pro 4

Claude Fable 5 leads the LLM Stats Score 55.9 to 36.0. Solar Pro 4 is 38.1x cheaper per token.

Anthropic · Upstage · Updated for 2026

Which is better?

Claude Fable 5 leads the overall LLM Stats Score 55.9 to 36.0, ranking #4 overall.

In the 2 individual benchmarks reported for both models, Claude Fable 5 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Solar Pro 4 is roughly 38.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Fable 5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Fable 5

  • overall performance matters — it scores 55.9 and ranks #4 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you process long inputs — it offers a 1,000,000 token context window

Choose Solar Pro 4

  • cost matters — it's about 38.1x cheaper per token
  • you want the most recent training data — it shipped Aug 2026

At a glance

The differences that matter most.

Claude Fable 5
Anthropic
Solar Pro 4
Upstage
Core performance indexes
LLM Stats Score
55.9
#4
36.0
#72
Reasoning
53.3
#6
35.6
#71
Coding
48.7
#2
22.1
#73
Agents
42.5
#2
13.8
#84
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$10.00 / M
$0.30 / M
Output price
$50.00 / M
$1.20 / M
Context window
1,000,000
524,288

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Fable 5
Solar Pro 4
Math
41.8#7
32.0#55
Tool use
25.1#29
15.3#81
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

18 reported for Claude Fable 5 · 9 for Solar Pro 4

2 shared

Claude Fable 5 outperforms in 2 benchmarks (SWE-Bench Verified, Terminal-Bench 2.1), while Solar Pro 4 is better at 0 benchmarks.

Claude Fable 5 significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Solar Pro 4 costs less

For input processing, Claude Fable 5 ($10.00/1M tokens) is 33.3x more expensive than Solar Pro 4 ($0.30/1M tokens).

For output processing, Claude Fable 5 ($50.00/1M tokens) is 41.7x more expensive than Solar Pro 4 ($1.20/1M tokens).

In conclusion, Claude Fable 5 is more expensive than Solar Pro 4.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Aug 28 2026 • llm-stats.com
Anthropic
Claude Fable 5
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Upstage
Solar Pro 4
Input tokens$0.30
Output tokens$1.20
Best providerUnknown Organization
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Fable 5 accepts 1,000,000 input tokens compared to Solar Pro 4's 524,288 tokens. Solar Pro 4 can generate longer responses up to 131,072 tokens, while Claude Fable 5 is limited to 128,000 tokens.

Anthropic
Claude Fable 5
Input1,000,000 tokens
Output128,000 tokens
Upstage
Solar Pro 4
Input524,288 tokens
Output131,072 tokens
Fri Aug 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Fable 5 supports multimodal inputs, whereas Solar Pro 4 does not.

Claude Fable 5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Fable 5

Text
Images
Audio
Video

Solar Pro 4

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Fable 5

Proprietary

Closed source

Solar Pro 4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5 was released on 2026-06-09, while Solar Pro 4 was released on 2026-08-06.

Solar Pro 4 is 2 months newer than Claude Fable 5.

Claude Fable 5

Jun 9, 2026

2 months ago

Solar Pro 4

Aug 6, 2026

3 weeks ago

1mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Fable 5 is available from Anthropic. Solar Pro 4 is available from Upstage.

Claude Fable 5

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Solar Pro 4

upstage logo
Unknown Organization
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5 and Solar Pro 4 side-by-side, then vote on the output you prefer.

Claude Fable 5
✓ Preferred
Solar Pro 4
Open in Playground

FAQ

Common questions about Claude Fable 5 vs Solar Pro 4.

Which is better, Claude Fable 5 or Solar Pro 4?

Claude Fable 5 leads the LLM Stats Score 55.9 to 36.0. Claude Fable 5 is made by Anthropic and Solar Pro 4 is made by Upstage. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5 compare to Solar Pro 4 in benchmarks?

Claude Fable 5 scores SWE-Bench Verified: 95.0%, FrontierSWE: 90.0%, OSWorld-Verified: 85.0%, Terminal-Bench 2.1: 84.3%, SWE-Bench Pro: 80.0%. Solar Pro 4 scores AIME 2026: 95.3%, GPQA: 89.0%, LiveCodeBench: 87.8%, MMLU-Pro: 86.3%, AA-LCR: 71.0%.

Is Claude Fable 5 cheaper than Solar Pro 4?

Solar Pro 4 is 33.3x cheaper for input tokens. Claude Fable 5 costs $10.00/M input and $50.00/M output via anthropic. Solar Pro 4 costs $0.30/M input and $1.20/M output via upstage.

What are the context window sizes for Claude Fable 5 and Solar Pro 4?

Claude Fable 5 supports 1.0M tokens and Solar Pro 4 supports 524K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5 and Solar Pro 4?

Key differences include LLM Stats Score (55.9 vs 36.0), context window (1.0M vs 524K), input pricing ($10.00 vs $0.30/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5 and Solar Pro 4?

Claude Fable 5 is developed by Anthropic and Solar Pro 4 is developed by Upstage.

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