AI Model Comparison

GPT-5.5 Instant vs. Claude Opus 4.7

Compare GPT-5.5 Instant (May 2026) vs Claude Opus 4.7 (Adaptive Reasoning, Max Effort) with benchmark results, speed, pricing, and practical workflow guidance.

Best For GPT-5.5 Instant (May 2026)

  • OpenAI ecosystem users
  • Direct finance integration
  • Cost-effective input tasks

Best For Claude Opus 4.7 (Adaptive Reasoning, Max Effort)

  • Complex reasoning tasks
  • Data-driven workflows
  • High-transparency requirements

This comparison evaluates OpenAI’s GPT-5.5 Instant and Anthropic’s Claude Opus 4.7, analyzing their respective pricing, performance metrics, and recent industry positioning to help you determine the optimal model for your specific technical or financial requirements.

Quick Take

OpenAI’s GPT-5.5 Instant (released May 5, 2026) and Anthropic’s Claude Opus 4.7 (released April 16, 2026) represent the latest iterations in the competitive AI landscape. While both models offer distinct pricing structures, they differ significantly in transparency regarding performance and benchmark capabilities.

Benchmark Read

Claude Opus 4.7 provides a comprehensive suite of performance metrics. It holds an Intelligence index of 57.3 and a Coding index of 52.5. Specific benchmark results include:

  • GPQA: 0.914
  • HLE: 0.396
  • SciCode: 0.545
  • IFBench: 0.586
  • LCR: 0.703
  • TerminalBench Hard: 0.515
  • TAU2: 0.885

In contrast, GPT-5.5 Instant currently has no public benchmark rows, intelligence index, coding index, or math index available for comparison.

Cost and Speed

Pricing models vary between the two providers:

  • GPT-5.5 Instant: Input costs $5.00/1M tokens, output costs $30.00/1M tokens, resulting in a blended cost of $11.25/1M tokens.
  • Claude Opus 4.7: Input costs $6.25/1M tokens, output costs $25.00/1M tokens, resulting in a blended cost of $10.94/1M tokens.

Regarding performance, Claude Opus 4.7 operates at an output speed of 48.627 tokens per second with a time-to-first-token of 14.653 seconds. Corresponding performance metrics for GPT-5.5 Instant remain unknown.

Best Fit

Claude Opus 4.7 is best suited for developers and enterprises that require verifiable performance data and high-reasoning capabilities. GPT-5.5 Instant may be considered by users already integrated into the OpenAI ecosystem, particularly those utilizing new features like the recently launched personal finance tools for ChatGPT Pro subscribers.

Benchmark table

Side-by-side scores, speed, and pricing for the selected models.

Metric OpenAI GPT-5.5 Instant (May 2026) Anthropic Claude Opus 4.7 (Adaptive Reasoning, Max Effort)
Index Scores
Intelligence Index- 57.3
Coding Index- 52.5
Math Index--
Benchmark Scores
GPQA- 91.4
SciCode- 54.5
IFBench- 58.6
HLE- 39.6
LCR- 70.3
TAU2- 88.6
TerminalBench Hard- 51.5

Verdict

Choose Claude Opus 4.7 if you require transparent performance data and specific benchmark validation for complex reasoning tasks. While GPT-5.5 Instant offers a competitive blended price, its lack of public performance metrics and benchmark data makes it difficult to verify against specific use cases. Claude Opus 4.7 is the clear choice for users prioritizing data-driven reliability and documented speed.

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