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Model Comparison

Claude Sonnet 4.6 vs GPT-5.5

GPT-5.5 significantly outperforms across most benchmarks. Claude Sonnet 4.6 is 1.9x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

9 benchmarks

Claude Sonnet 4.6 outperforms in 1 benchmarks (Finance Agent), while GPT-5.5 is better at 8 benchmarks (ARC-AGI v2, BrowseComp, GPQA, Humanity's Last Exam, MCP Atlas, MMMU-Pro, Tau2 Telecom, Terminal-Bench 2.0).

GPT-5.5 significantly outperforms across most benchmarks.

Thu Apr 23 2026 • llm-stats.com

Arena Performance

Human preference votes

CallingBox

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$0.05 /min all-in7 lines of code

Pricing Analysis

Price comparison per million tokens

Claude Sonnet 4.6 costs less

For input processing, Claude Sonnet 4.6 ($3.00/1M tokens) is 1.7x cheaper than GPT-5.5 ($5.00/1M tokens).

For output processing, Claude Sonnet 4.6 ($15.00/1M tokens) is 2.0x cheaper than GPT-5.5 ($30.00/1M tokens).

In conclusion, GPT-5.5 is more expensive than Claude Sonnet 4.6.*

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

Lowest available price from all providers
Thu Apr 23 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.6
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT-5.5
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.5 accepts 1,000,000 input tokens compared to Claude Sonnet 4.6's 200,000 tokens. GPT-5.5 can generate longer responses up to 128,000 tokens, while Claude Sonnet 4.6 is limited to 64,000 tokens.

Anthropic
Claude Sonnet 4.6
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-5.5
Input1,000,000 tokens
Output128,000 tokens
Thu Apr 23 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.6 and GPT-5.5 support multimodal inputs.

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

Claude Sonnet 4.6

Text
Images
Audio
Video

GPT-5.5

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 Sonnet 4.6

Proprietary

Closed source

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.6 was released on 2026-02-17, while GPT-5.5 was released on 2026-04-23.

GPT-5.5 is 2 months newer than Claude Sonnet 4.6.

Claude Sonnet 4.6

Feb 17, 2026

2 months ago

GPT-5.5

Apr 23, 2026

0 days ago

2mo 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 Sonnet 4.6 is available from Anthropic. GPT-5.5 is available from OpenAI.

Claude Sonnet 4.6

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

GPT-5.5

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Less expensive input tokens
Less expensive output tokens
Higher Finance Agent score (63.3% vs 60.0%)
OpenAI
Larger context window (1,000,000 tokens)
Higher ARC-AGI v2 score (85.0% vs 58.3%)
Higher BrowseComp score (84.4% vs 74.7%)
Higher GPQA score (93.6% vs 89.9%)
Higher Humanity's Last Exam score (52.2% vs 49.0%)
Higher MCP Atlas score (75.3% vs 61.3%)
Higher MMMU-Pro score (83.2% vs 75.6%)
Higher Tau2 Telecom score (98.0% vs 97.9%)
Higher Terminal-Bench 2.0 score (82.7% vs 59.1%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.6
OpenAI
GPT-5.5

FAQ

Common questions about Claude Sonnet 4.6 vs GPT-5.5

GPT-5.5 significantly outperforms across most benchmarks. Claude Sonnet 4.6 is made by Anthropic and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Sonnet 4.6 scores Tau2 Telecom: 97.9%, Tau2 Retail: 91.7%, GPQA: 89.9%, MMMLU: 89.3%, SWE-Bench Verified: 79.6%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.
Claude Sonnet 4.6 is 1.7x cheaper for input tokens. Claude Sonnet 4.6 costs $3.00/M input and $15.00/M output via anthropic. GPT-5.5 costs $5.00/M input and $30.00/M output via openai.
Claude Sonnet 4.6 supports 200K tokens and GPT-5.5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 1.0M), input pricing ($3.00 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.
Claude Sonnet 4.6 is developed by Anthropic and GPT-5.5 is developed by OpenAI.