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Claude Opus 5.5 vs Inkling 2 Small

Claude Opus 5.5 leads the LLM Stats Score 58.9 to 47.1. Inkling 2 Small is 16.8x cheaper per token.

Anthropic · Thinking Machines Lab · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 58.9 to 47.1, ranking #3 overall.

On price, Inkling 2 Small is roughly 16.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 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 Opus 5.5

  • overall performance matters — it scores 58.9 and ranks #3 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you process long inputs — it offers a 1,000,000 token context window

Choose Inkling 2 Small

  • cost matters — it's about 16.8x cheaper per token
  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
Inkling 2 Small
Thinking Machines Lab
Core performance indexes
LLM Stats Score
58.9
#3
47.1
#41
Reasoning
57.6
#2
47.8
#26
Coding
48.8
#2
36.2
#35
Agents
44.5
#3
33.3
#39
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$0.30 / M
Output price
$20.00 / M
$1.00 / M
Context window
1,000,000
256,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Opus 5.5
Inkling 2 Small
Vision
41.5#2
29.2#47
Tool use
33.4#6
28.3#28
Multimodal
41.0#2
28.9#44
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

32 reported for Claude Opus 5.5 · 11 for Inkling 2 Small

No common benchmarks found

Claude Opus 5.5 and Inkling 2 Smalldon'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

Inkling 2 Small costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 13.3x more expensive than Inkling 2 Small ($0.30/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 20.0x more expensive than Inkling 2 Small ($1.00/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than Inkling 2 Small.*

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

Lowest available price from all providers
Mon Nov 09 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
Thinking Machines Lab
Inkling 2 Small
Input tokens$0.30
Output tokens$1.00
Best providerUnknown Organization
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Claude Opus 5.5 accepts 1,000,000 input tokens compared to Inkling 2 Small's 256,000 tokens. Only Claude Opus 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Thinking Machines Lab
Inkling 2 Small
Input256,000 tokens
Output- tokens
Mon Nov 09 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5.5 and Inkling 2 Small support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 5.5

Text
Images
Audio
Video

Inkling 2 Small

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 Opus 5.5

Proprietary

Closed source

Inkling 2 Small

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while Inkling 2 Small was released on 2026-11-05.

Inkling 2 Small is 1 month newer than Claude Opus 5.5.

Claude Opus 5.5

Sep 22, 2026

1 months ago

Inkling 2 Small

Nov 5, 2026

4 days ago

1mo newer

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Inkling 2 Small's cutoff date is not specified.

We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Inkling 2 Small's cutoff date.

Claude Opus 5.5

Jun 2026

Inkling 2 Small

—

Provider Availability

Claude Opus 5.5 is available from Anthropic. Inkling 2 Small is available from Thinking Machines Lab.

Claude Opus 5.5

anthropic logo
Anthropic
Input Price:Input: $4.00/1MOutput Price:Output: $20.00/1M

Inkling 2 Small

thinking-machines logo
Unknown Organization
Input Price:Input: $0.30/1MOutput Price:Output: $1.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Opus 5.5 and Inkling 2 Small side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
Inkling 2 Small
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs Inkling 2 Small.

Which is better, Claude Opus 5.5 or Inkling 2 Small?

Claude Opus 5.5 leads the LLM Stats Score 58.9 to 47.1. Claude Opus 5.5 is made by Anthropic and Inkling 2 Small is made by Thinking Machines Lab. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5.5 compare to Inkling 2 Small in benchmarks?

Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%. Inkling 2 Small scores GPQA: 93.0%, BrowseComp: 90.2%, CharXiv-R: 85.6%, MCP Atlas: 85.0%, SWE-Bench Verified: 82.2%.

Is Claude Opus 5.5 cheaper than Inkling 2 Small?

Inkling 2 Small is 13.3x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. Inkling 2 Small costs $0.30/M input and $1.00/M output via thinking-machines.

What are the context window sizes for Claude Opus 5.5 and Inkling 2 Small?

Claude Opus 5.5 supports 1.0M tokens and Inkling 2 Small supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 5.5 and Inkling 2 Small?

Key differences include LLM Stats Score (58.9 vs 47.1), context window (1.0M vs 256K), input pricing ($4.00 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and Inkling 2 Small?

Claude Opus 5.5 is developed by Anthropic and Inkling 2 Small is developed by Thinking Machines Lab.

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