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Claude Opus 5.5 vs GPT-4 Turbo

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 9.0. Claude Opus 5.5 is 1.9x cheaper per token.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.7 to 9.0, ranking #1 overall.

On price, Claude Opus 5.5 is roughly 1.9x 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 59.7 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • cost matters — it's about 1.9x 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 Sep 2026

Choose GPT-4 Turbo

  • you want predictable pricing at $10.00/M input and $30.00/M output

At a glance

The differences that matter most.

Claude Opus 5.5
Anthropic
GPT-4 Turbo
OpenAI
Core performance indexes
LLM Stats Score
59.7
#1
9.0
#276
Reasoning
57.8
#1
9.2
#272
Coding
51.7
#1
7.2
#191
Cost, coverage & limits
Benchmark wins
—
—
Input price
$4.00 / M
$10.00 / M
Output price
$20.00 / M
$30.00 / M
Context window
1,000,000
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Opus 5.5
GPT-4 Turbo
Math
42.5#5
17.2#198
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

31 reported for Claude Opus 5.5 · 6 for GPT-4 Turbo

No common benchmarks found

Claude Opus 5.5 and GPT-4 Turbodon'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 Opus 5.5 costs less

For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 2.5x cheaper than GPT-4 Turbo ($10.00/1M tokens).

For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 1.5x cheaper than GPT-4 Turbo ($30.00/1M tokens).

In conclusion, GPT-4 Turbo is more expensive than Claude Opus 5.5.*

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

Lowest available price from all providers
Tue Sep 22 2026 • llm-stats.com
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
OpenAI
GPT-4 Turbo
Input tokens$10.00
Output tokens$30.00
Best providerAzure
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 5.5 accepts 1,000,000 input tokens compared to GPT-4 Turbo's 128,000 tokens. Claude Opus 5.5 can generate longer responses up to 128,000 tokens, while GPT-4 Turbo is limited to 4,096 tokens.

Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 5.5 supports multimodal inputs, whereas GPT-4 Turbo does not.

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

Claude Opus 5.5

Text
Images
Audio
Video

GPT-4 Turbo

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

GPT-4 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5.5 was released on 2026-09-22, while GPT-4 Turbo was released on 2024-04-09.

Claude Opus 5.5 is 30 months newer than GPT-4 Turbo.

Claude Opus 5.5

Sep 22, 2026

0 days ago

2.5yr newer
GPT-4 Turbo

Apr 9, 2024

2.5 years ago

Knowledge Cutoff

When training data ends

Claude Opus 5.5 has a knowledge cutoff of 2026-06-01, while GPT-4 Turbo has a cutoff of 2023-12-31.

Claude Opus 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to GPT-4 Turbo (2023-12-31).

Claude Opus 5.5

Jun 2026

2.5 yr newer
GPT-4 Turbo

Dec 2023

Provider Availability

Claude Opus 5.5 is available from Anthropic. GPT-4 Turbo is available from Azure, OpenAI.

Claude Opus 5.5

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

GPT-4 Turbo

azure logo
Azure
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M
openai logo
OpenAI
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M
* 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 Opus 5.5 and GPT-4 Turbo side-by-side, then vote on the output you prefer.

Claude Opus 5.5
✓ Preferred
GPT-4 Turbo
Open in Playground

FAQ

Common questions about Claude Opus 5.5 vs GPT-4 Turbo.

Which is better, Claude Opus 5.5 or GPT-4 Turbo?

Claude Opus 5.5 leads the LLM Stats Score 59.7 to 9.0. Claude Opus 5.5 is made by Anthropic and GPT-4 Turbo is made by OpenAI. 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 GPT-4 Turbo 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%. GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%.

Is Claude Opus 5.5 cheaper than GPT-4 Turbo?

Claude Opus 5.5 is 2.5x cheaper for input tokens. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic. GPT-4 Turbo costs $10.00/M input and $30.00/M output via azure.

What are the context window sizes for Claude Opus 5.5 and GPT-4 Turbo?

Claude Opus 5.5 supports 1.0M tokens and GPT-4 Turbo supports 128K 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 GPT-4 Turbo?

Key differences include LLM Stats Score (59.7 vs 9.0), context window (1.0M vs 128K), input pricing ($4.00 vs $10.00/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5.5 and GPT-4 Turbo?

Claude Opus 5.5 is developed by Anthropic and GPT-4 Turbo is developed by OpenAI.

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