ModelRefs / Claude 3 Opus vs Gemini 2.5 Flash
Claude 3 Opus vs Gemini 2.5 Flash
Claude 3 Opus vs Gemini 2.5 Flash: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Claude 3 Opus: Claude 3 Opus is Anthropic's February 2024 frontier model and the most capable of the original Claude 3 family, accepting text and image input across a 200,000-token context window. The claude-3-opus-20240229 snapshot was deprecated on 30 June 2025 and retired on Anthropic-operated platforms on 5 January 2026, with Claude Opus 4.8 named as its replacement.
Gemini 2.5 Flash: Gemini 2.5 Flash is Google DeepMind's price-performance model for low-latency, high-volume work that still needs reasoning, with thinking supported. It accepts text, image, audio and video input across a 1,048,576-token context window, returns up to 65,536 tokens, and carries a January 2025 knowledge cutoff. Google now limits access to existing users while keeping the model served.
Context window: Claude 3 Opus accepts up to 200,000 tokens, Gemini 2.5 Flash up to 1,000,000. Confirm the limit for your specific deployment channel before relying on it.
Claude 3 Opus vs Gemini 2.5 Flash at a glance
| Attribute | Claude 3 Opus | Gemini 2.5 Flash |
|---|---|---|
| Provider | Anthropic | |
| Released | 2024-02-29 | 2025-06-17 |
| Context window | 200,000 tokens | 1,000,000 tokens |
| Input price | $15/M tokens | $0.075/M tokens |
| Output price | $75/M tokens | $0.3/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text, vision | text, vision, audio |
Benchmarks reported for both
| Benchmark | Claude 3 Opus | Gemini 2.5 Flash | Reported |
|---|---|---|---|
| GPQA Diamond (accuracy) | 50.4 | 82.8 | 2024-03-04 |
Each row compares the same benchmark, the same reported metric, and the same task set. Scores are as published by their cited sources on the dates shown. Different runs still use different harnesses and prompts, so treat these as directional evidence rather than a head-to-head result.
Where they differ most
- Reasoning: Claude 3 Opus 38%, Gemini 2.5 Flash 86%. Gemini 2.5 Flash leads on this dimension.
Capability scores are ModelRefs' own derived signals, not vendor claims or benchmark results. Validate against your own workload before relying on them.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to Claude 3 Opus vs Gemini 2.5 Flash.
Frequently asked questions
Which is better, Claude 3 Opus or Gemini 2.5 Flash?
Claude 3 Opus and Gemini 2.5 Flash target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is Claude 3 Opus cheaper than Gemini 2.5 Flash?
Compare $0.0150 vs $0.00007 on this page.