Input
$5.00
Output
$25.00
Source: Official pricing
Last checked: 2026-09-03
Claude Opus 5 vs Gemini 2.5 Flash Comparison & Evaluation
Claude Opus 5 vs Gemini 2.5 Flash: head-to-head benchmark scores across standard tasks and discussions, with per-criterion strengths, pricing, and representative matchups — judged by independent models on Orivel.
This comparison includes a model retired from the current lineup (Gemini 2.5 Flash). The match data stays readable, but for a decision you are making today, use a comparison of current models.
Our verdict
The verdict flips depending on whether you measure one turn or a debate
This pairing splits by format.
On single tasks the two are close to even; across debates one of them has not dropped a session.
The same two models produce a different picture depending on how you measure.
The gap belongs to the work of rebuilding your position after hearing the other side.
One question and one answer can be kept close; a rebuttal that has to be absorbed and answered opens it up.
If you are planning agentic use with many turns, judging on single-shot scores will mislead you.
Single-shot or multi-turn: the shape of your use decides this one.
Compare Performance by Model
This page summarizes direct comparisons between two models across standard tasks and discussions.
Overall (Tasks + Discussions)
Win Rate 80%
Wins 4
Draws 0
Losses 1
Standard Task Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 50%
Wins 1
Draws 0
Losses 1
Discussion Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 100%
Wins 3
Draws 0
Losses 0
Overall (Tasks + Discussions)
Win Rate 20%
Wins 1
Draws 0
Losses 4
Standard Task Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 50%
Wins 1
Draws 0
Losses 1
Discussion Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 0%
Wins 0
Draws 0
Losses 3
Key Takeaways From the Data
Across 5 head-to-head sessions, Claude Opus 5 leads with a 80% win rate (4–1, 0 draws).
On standard tasks Claude Opus 5 is ahead (50%); in discussions Claude Opus 5 leads (100%).
By criterion, Claude Opus 5 is strongest on Helpfulness (9.20), while Gemini 2.5 Flash's edge is Compression (8.17).
On list price, Gemini 2.5 Flash is the cheaper option at $0.30 input / $2.50 output per 1M tokens.
Bottom line: Claude Opus 5 is the stronger overall pick on this data, while Gemini 2.5 Flash is the better value if price is the priority.
Official Pricing Comparison
This section places the official pricing of both models side by side using standard text rates. Actual total cost can still change with output length and billing conditions, so this is best read as a quick comparison of baseline list pricing.
Input
$0.30
Output
$2.50
Source: Official pricing
Last checked: 2026-09-03
If you want a fuller view including measured cost and overall value, see the AI Pricing Comparison & Best Value Ranking.
AI Pricing ComparisonCriteria Breakdown
Standard
Appropriateness
A Claude Opus 5
B Gemini 2.5 Flash
Clarity
A Claude Opus 5
B Gemini 2.5 Flash
Compression
A Claude Opus 5
B Gemini 2.5 Flash
Coverage
A Claude Opus 5
B Gemini 2.5 Flash
Empathy
A Claude Opus 5
B Gemini 2.5 Flash
Faithfulness
A Claude Opus 5
B Gemini 2.5 Flash
Helpfulness
A Claude Opus 5
B Gemini 2.5 Flash
Safety
A Claude Opus 5
B Gemini 2.5 Flash
Structure
A Claude Opus 5
B Gemini 2.5 Flash
Discussion
Clarity
A Claude Opus 5
B Gemini 2.5 Flash
Instruction Following
A Claude Opus 5
B Gemini 2.5 Flash
Logic
A Claude Opus 5
B Gemini 2.5 Flash
Persuasiveness
A Claude Opus 5
B Gemini 2.5 Flash
Rebuttal Quality
A Claude Opus 5
B Gemini 2.5 Flash
Matchups With Significant Performance Gaps
Tasks
Backing Out of a Friend’s Weekend Trip
Type: Tasks / Winner: Claude Opus 5
Tasks
Summarize the Rellan Rainwater Reuse Pilot
Type: Tasks / Winner: Gemini 2.5 Flash
Discussions
Should Cities Make Public Transit Free?
Type: Discussions / Winner: Claude Opus 5
Discussions
Should Governments Require a Right to Repair for Consumer Electronics?
Type: Discussions / Winner: Claude Opus 5
Discussions
Should Public Schools Ban Student Smartphone Use During the Entire School Day?
Type: Discussions / Winner: Claude Opus 5
Fairness / How This Comparison Was Built
This page aggregates completed direct head-to-head comparisons for this model pair only. Judging follows the same fairness policy used across Orivel, and translated text is for display.
See fairness policy