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  1. Home
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  3. Compare

Claude Opus 5 vs Gemini 3.8 Flash

Compare Claude Opus 5 from Anthropic and Gemini 3.8 Flash from Google on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.

Favicon for anthropic
Claude Opus 5
Favicon for google
Gemini 3.8 Flash
Favicon for anthropic
Claude Opus 5
Favicon for google
Gemini 3.8 Flash

Overview

Claude Opus 5
Author
Anthropic
Gemini 3.8 Flash
Author
Google
Claude Opus 5
Context length
1Mtokens
Gemini 3.8 Flash
Context length
1.05Mtokens
Claude Opus 5
Reasoning
Gemini 3.8 Flash
Reasoning
Claude Opus 5
Input modalities
Gemini 3.8 Flash
Input modalities
Claude Opus 5
Output modalities
Gemini 3.8 Flash
Output modalities

Claude Opus 5 vs Gemini 3.8 Flash: side-by-side summary

Claude Opus 5 and Gemini 3.8 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 5, from Anthropic, has a 1,000,000-token context window and is priced at $5/M tokens input, $25/M tokens output on OpenRouter.

Gemini 3.8 Flash, from Google, has a 1,048,576-token context window and is priced at $0.75/M tokens input, $3.75/M tokens output on OpenRouter.

Context window
  • Claude Opus 5: 1,000,000 tokens
  • Gemini 3.8 Flash: 1,048,576 tokens
Price
  • Claude Opus 5: $5/M tokens input, $25/M tokens output
  • Gemini 3.8 Flash: $0.75/M tokens input, $3.75/M tokens output
Provided by
  • Claude Opus 5: Anthropic
  • Gemini 3.8 Flash: Google
  • Claude Opus 5 model details, providers and pricing
  • Gemini 3.8 Flash model details, providers and pricing

Claude Opus 5 vs Gemini 3.8 Flash at a glance

Claude Opus 5 vs Gemini 3.8 Flash comparison
AttributeClaude Opus 5Gemini 3.8 Flash
Input price$5/M tokens$0.75/M tokens
Output price$25/M tokens$3.75/M tokens
Context window1,000,000 tokens1,048,576 tokens
Intelligence Index50.840.9
Coding Index78.076.3
Agentic Index56.540.2
Latency (p50)3.49 s2.38 s
Throughput (p50)68.0 tok/s76.0 tok/s

Benchmark data updated Oct 24, 2026

Frequently asked questions

Is Claude Opus 5 cheaper than Gemini 3.8 Flash?

Gemini 3.8 Flash is cheaper than Claude Opus 5 on OpenRouter: Gemini 3.8 Flash costs $0.75/M tokens input and $3.75/M tokens output, while Claude Opus 5 costs $5/M tokens input and $25/M tokens output.

Which has the longer context window, Claude Opus 5 or Gemini 3.8 Flash?

Gemini 3.8 Flash has the longer context window at 1,048,576 tokens, compared with 1,000,000 tokens for Claude Opus 5.

Which is faster, Claude Opus 5 or Gemini 3.8 Flash?

Gemini 3.8 Flash is faster on OpenRouter, generating a median 76.0 tokens per second compared with 68.0 tokens per second for Claude Opus 5.

Which scores higher on coding, Claude Opus 5 or Gemini 3.8 Flash?

Claude Opus 5 scores higher on coding, with an Artificial Analysis Coding Index of 78.0 compared with 76.3 for Gemini 3.8 Flash.