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Claude Haiku 5.5 vs Solar Pro 4

Claude Haiku 5.5 leads the LLM Stats Score 50.0 to 35.0. Claude Haiku 5.5 is 2.6x cheaper per token.

Anthropic · Upstage · Updated for 2026

Which is better?

Claude Haiku 5.5 leads the overall LLM Stats Score 50.0 to 35.0, ranking #19 overall.

On price, Claude Haiku 5.5 is roughly 2.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Haiku 5.5 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 Haiku 5.5

  • overall performance matters — it scores 50.0 and ranks #19 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • cost matters — it's about 2.6x cheaper per token
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Oct 2026

Choose Solar Pro 4

  • you want predictable pricing at $0.30/M input and $1.20/M output

At a glance

The differences that matter most.

Claude Haiku 5.5
Anthropic
Solar Pro 4
Upstage
Core performance indexes
LLM Stats Score
50.0
#19
35.0
#102
Reasoning
47.2
#27
34.6
#97
Coding
40.2
#13
20.8
#104
Agents
33.3
#28
11.3
#123
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
$0.30 / M
Output price
$0.50 / 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 Haiku 5.5
Solar Pro 4
Math
25.7#110
32.3#63
Tool use
20.3#59
8.5#147
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

36 reported for Claude Haiku 5.5 · 9 for Solar Pro 4

No common benchmarks found

Claude Haiku 5.5 and Solar Pro 4don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Claude Haiku 5.5 costs less

For input processing, Claude Haiku 5.5 ($0.10/1M tokens) is 3.0x cheaper than Solar Pro 4 ($0.30/1M tokens).

For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 2.4x cheaper than Solar Pro 4 ($1.20/1M tokens).

In conclusion, Solar Pro 4 is more expensive than Claude Haiku 5.5.*

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

Lowest available price from all providers
Sun Oct 11 2026 • llm-stats.com
Anthropic
Claude Haiku 5.5
Input tokens$0.10
Output tokens$0.50
Best providerAnthropic
Upstage
Solar Pro 4
Input tokens$0.30
Output tokens$1.20
Best providerUnknown Organization
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Claude Haiku 5.5 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 Haiku 5.5 is limited to 128,000 tokens.

Anthropic
Claude Haiku 5.5
Input1,000,000 tokens
Output128,000 tokens
Upstage
Solar Pro 4
Input524,288 tokens
Output131,072 tokens
Sun Oct 11 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Haiku 5.5 supports multimodal inputs, whereas Solar Pro 4 does not.

Claude Haiku 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Haiku 5.5

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 Haiku 5.5

Proprietary

Closed source

Solar Pro 4

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 5.5 was released on 2026-10-07, while Solar Pro 4 was released on 2026-08-06.

Claude Haiku 5.5 is 2 months newer than Solar Pro 4.

Claude Haiku 5.5

Oct 7, 2026

4 days ago

2mo newer
Solar Pro 4

Aug 6, 2026

2 months ago

Knowledge Cutoff

When training data ends

Claude Haiku 5.5 has a documented knowledge cutoff of 2026-06-01, while Solar Pro 4's cutoff date is not specified.

We can confirm Claude Haiku 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Solar Pro 4's cutoff date.

Claude Haiku 5.5

Jun 2026

Solar Pro 4

—

Provider Availability

Claude Haiku 5.5 is available from Anthropic. Solar Pro 4 is available from Upstage.

Claude Haiku 5.5

anthropic logo
Anthropic
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

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?

Judge for yourself.

Run your own prompts against Claude Haiku 5.5 and Solar Pro 4 side-by-side, then vote on the output you prefer.

Claude Haiku 5.5
✓ Preferred
Solar Pro 4
Open in Playground

FAQ

Common questions about Claude Haiku 5.5 vs Solar Pro 4.

Which is better, Claude Haiku 5.5 or Solar Pro 4?

Claude Haiku 5.5 leads the LLM Stats Score 50.0 to 35.0. Claude Haiku 5.5 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 Haiku 5.5 compare to Solar Pro 4 in benchmarks?

Claude Haiku 5.5 scores Global-MMLU: 87.8%, MILU: 87.6%, BenchCAD (with Python tool): 87.0%, Chartography: 86.2%, SWE-bench Multilingual: 83.7%. Solar Pro 4 scores AIME 2026: 95.3%, GPQA: 89.0%, LiveCodeBench: 87.8%, MMLU-Pro: 86.3%, AA-LCR: 71.0%.

Is Claude Haiku 5.5 cheaper than Solar Pro 4?

Claude Haiku 5.5 is 3.0x cheaper for input tokens. Claude Haiku 5.5 costs $0.10/M input and $0.50/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 Haiku 5.5 and Solar Pro 4?

Claude Haiku 5.5 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 Haiku 5.5 and Solar Pro 4?

Key differences include LLM Stats Score (50.0 vs 35.0), context window (1.0M vs 524K), input pricing ($0.10 vs $0.30/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 5.5 and Solar Pro 4?

Claude Haiku 5.5 is developed by Anthropic and Solar Pro 4 is developed by Upstage.

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