Input
$2.00
Output
$10.00
Source: Official pricing
Last checked: 2026-09-03
Claude Sonnet 5 vs Gemini 2.5 Flash Comparison & Evaluation
Claude Sonnet 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
Can summarisation alone be left to the cheaper model?
The more expensive model leads overall, but the cheaper one takes summarisation back.
This is a clear case of a verdict that reverses once you narrow the category.
The gap holds in analysis, teaching-style replies, and answers that need to read a feeling.
The split reads as work where the input largely determines the answer, against work where judgement and care have to be added — and those two land on different sides here.
For work like summarisation, where the input decides the answer, there is a case for the cheaper model.
Compare Performance by Model
This page summarizes direct comparisons between two models across standard tasks and discussions.
Overall (Tasks + Discussions)
Win Rate 100%
Wins 5
Draws 0
Losses 0
Standard Task Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 100%
Wins 4
Draws 0
Losses 0
Discussion Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 100%
Wins 1
Draws 0
Losses 0
Overall (Tasks + Discussions)
Win Rate 0%
Wins 0
Draws 0
Losses 5
Standard Task Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 0%
Wins 0
Draws 0
Losses 4
Discussion Comparison
This comparison is based on limited data and should be treated as provisional.
Win Rate 0%
Wins 0
Draws 0
Losses 1
Key Takeaways From the Data
Across 5 head-to-head sessions, Claude Sonnet 5 leads with a 100% win rate (5–0, 0 draws).
On standard tasks Claude Sonnet 5 is ahead (100%); in discussions Claude Sonnet 5 leads (100%).
By criterion, Claude Sonnet 5 is strongest on Instruction Following (9.33), while Gemini 2.5 Flash's edge is Compression (8.40).
On list price, Gemini 2.5 Flash is the cheaper option at $0.30 input / $2.50 output per 1M tokens.
Bottom line: Claude Sonnet 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 Sonnet 5
B Gemini 2.5 Flash
Clarity
A Claude Sonnet 5
B Gemini 2.5 Flash
Completeness
A Claude Sonnet 5
B Gemini 2.5 Flash
Compression
A Claude Sonnet 5
B Gemini 2.5 Flash
Correctness
A Claude Sonnet 5
B Gemini 2.5 Flash
Coverage
A Claude Sonnet 5
B Gemini 2.5 Flash
Depth
A Claude Sonnet 5
B Gemini 2.5 Flash
Empathy
A Claude Sonnet 5
B Gemini 2.5 Flash
Faithfulness
A Claude Sonnet 5
B Gemini 2.5 Flash
Helpfulness
A Claude Sonnet 5
B Gemini 2.5 Flash
Instruction Following
A Claude Sonnet 5
B Gemini 2.5 Flash
Reasoning Quality
A Claude Sonnet 5
B Gemini 2.5 Flash
Safety
A Claude Sonnet 5
B Gemini 2.5 Flash
Structure
A Claude Sonnet 5
B Gemini 2.5 Flash
Discussion
Clarity
A Claude Sonnet 5
B Gemini 2.5 Flash
Instruction Following
A Claude Sonnet 5
B Gemini 2.5 Flash
Logic
A Claude Sonnet 5
B Gemini 2.5 Flash
Persuasiveness
A Claude Sonnet 5
B Gemini 2.5 Flash
Rebuttal Quality
A Claude Sonnet 5
B Gemini 2.5 Flash
Matchups With Significant Performance Gaps
Tasks
Choosing a Fare Policy After an Ambiguous Transit Pilot
Type: Tasks / Winner: Claude Sonnet 5
Tasks
Adjacency in a Random Derangement
Type: Tasks / Winner: Claude Sonnet 5
Tasks
Responding to a Friend Facing Caregiver Burnout
Type: Tasks / Winner: Claude Sonnet 5
Discussions
Should Universities Abolish Legacy Admissions?
Type: Discussions / Winner: Claude Sonnet 5
Tasks
Summarize the Lantern Loop Night-Transit Pilot
Type: Tasks / Winner: Claude Sonnet 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