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Claude Opus 4.6 vs Gemini 2.5 Flash

The readout for Claude Opus 4.6 and Gemini 2.5 Flash, before the detailed comparison sheet.

Model A

Claude Opus 4.6

Anthropic

Leading
vs

Model B

Gemini 2.5 Flash

Google

Contender

Key Takeaways

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

Claude Opus 4.6

Claude Opus 4.6 has the higher weighted result; Model A / B score 92 to 8.

Evidence depth

109 data points

Includes 22 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with Claude Opus 4.6

The charts below split 32 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for Claude Opus 4.6 and Gemini 2.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
Claude Opus 4.6
Gemini 2.5 Flash
Overall leaderLeadingContender
Weighted overall score92.0 pts8.0 pts
Benchmark category leads6 categories0 categories
Operational advantagesFirst-token latency, Free providers, Provider coverageCheapest input price, Average speed
Context window1M tokens1.0M tokens
Max output128K tokens65.5K tokens
Modalities

Input

TextImageFile

Output

Text

Input

FileImageTextAudiovideo

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
Claude Opus 4.6
Gemini 2.5 Flash
DeveloperAnthropicGoogle
ReleasedFeb 2026Jun 2025
ParametersNo dataNo data
TokenizerClaudeGemini
Knowledge cutoffNo data2025-01-31
OpenRouter IDanthropic/claude-opus-4.6google/gemini-2.5-flash
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for Claude Opus 4.6 and Gemini 2.5 Flash: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Claude Opus 4.6

Claude Opus 4.6 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Free providers, Provider coverage).

Gemini 2.5 Flash

Gemini 2.5 Flash has these operational advantages: Cheapest input price, Average speed.

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
8 / 8
Model B coverage
6 / 8
Shared
6 shared categories

Avg. score

Claude Opus 4.6

51.8

Avg. score

Gemini 2.5 Flash

43.8

Agents

Claude Opus 4.6 leads by 18.4

Claude Opus 4.654.3
Gemini 2.5 Flash35.9

Coding

Claude Opus 4.6 leads by 13.0

Claude Opus 4.656.6
Gemini 2.5 Flash43.6

Reasoning

Claude Opus 4.6 leads by 4.8

Claude Opus 4.653.4
Gemini 2.5 Flash48.6

Knowledge

Claude Opus 4.6 leads by 12.6

Claude Opus 4.653.3
Gemini 2.5 Flash40.7

Math

Claude Opus 4.6 leads by 5.1

Claude Opus 4.655.7
Gemini 2.5 Flash50.6

Multilingual

Claude Opus 4.6

Claude Opus 4.648.4
Gemini 2.5 Flash-

Multimodal

Claude Opus 4.6

Claude Opus 4.647.8
Gemini 2.5 Flash-

Instruction following

Claude Opus 4.6 leads by 1.6

Claude Opus 4.644.8
Gemini 2.5 Flash43.2

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

62.0

Rank #41/111 · confidence 4 · eval date 2026-02-01

+17.0

Gemini 2.5 Flash

45.0

Rank #94/111 · confidence 1 · eval date 2025-06-17

Pricingverified

Input price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$5.00/M

Rank #168/186 · confidence 4

+$4.70/M

Gemini 2.5 Flash

winner

$0.300/M

Rank #55/186 · confidence 4

Pricingverified

Blended price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$10.00/M

Rank #169/186 · confidence 4

+$9.15/M

Gemini 2.5 Flash

winner

$0.850/M

Rank #82/186 · confidence 4

Pricingverified

Output price

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

$25.00/M

Rank #169/186 · confidence 4

+$22.50/M

Gemini 2.5 Flash

winner

$2.50/M

Rank #89/186 · confidence 4

Reasoningreported

MMLU-Pro

SourceClaude Opus 4.6

Claude Opus 4.6

82.0%

Rank #50/129 · confidence 4 · eval date 2026-02-01

+1.2%

Gemini 2.5 Flash

winner

83.2%

Rank #42/129 · confidence 4

Reasoningreported

CritPt

SourceClaude Opus 4.6

Claude Opus 4.6

winner

2.8

Rank #57/88 · confidence 4 · eval date 2026-02-01

+1.4

Gemini 2.5 Flash

1.4

Rank #65/88 · confidence 1 · eval date 2025-06-17

Reasoningreported

AA-LCR

SourceClaude Opus 4.6

Claude Opus 4.6

winner

67.0

Rank #71/106 · confidence 4 · eval date 2026-02-01

+19.0

Gemini 2.5 Flash

48.0

Rank #89/106 · confidence 1 · eval date 2025-06-17

Reasoningverified

GPQA

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

winner

84.0%

Rank #75/218 · confidence 4

+5.0%

Gemini 2.5 Flash

79.0%

Rank #100/218 · confidence 4

Reasoningverified

HLE

SourceClaude Opus 4.6 (Non-reasoning, High Effort)

Claude Opus 4.6

winner

19.1%

Rank #89/216 · confidence 4

+7.0%

Gemini 2.5 Flash

12.1%

Rank #113/216 · confidence 4

Codingreported

AA-SciCode

SourceClaude Opus 4.6

Claude Opus 4.6

winner

45.7

Rank #54/113 · confidence 4 · eval date 2026-02-01

+16.6

Gemini 2.5 Flash

29.1

Rank #104/113 · confidence 1 · eval date 2025-06-17

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceClaude Opus 4.6

Claude Opus 4.6

winner

40.7

Rank #10/47 · confidence 4 · eval date 2026-02-01

+35.9

Gemini 2.5 Flash

4.8

Rank #38/47 · confidence 1 · eval date 2025-06-17

Mathreported

FrontierMath v2 (Tier 4)

SourceClaude Opus 4.6

Claude Opus 4.6

winner

22.9

Rank #11/36 · confidence 4 · eval date 2026-02-01

+18.7

Gemini 2.5 Flash

4.2

Rank #24/36 · confidence 1 · eval date 2025-06-17

Mathreported

BenchLM Math score

SourceClaude Opus 4.6

Claude Opus 4.6

winner

58.6

Rank #29/63 · confidence 4 · eval date 2026-02-01

+29.7

Gemini 2.5 Flash

28.9

Rank #51/63 · confidence 1 · eval date 2025-06-17

Knowledgereported

AA-Omniscience Hallucination Rate

SourceClaude Opus 4.6

Claude Opus 4.6

80.1

Rank #43/106 · confidence 4 · eval date 2026-02-01

+12.9

Gemini 2.5 Flash

winner

93.0

Rank #6/106 · confidence 1 · eval date 2025-06-17

Knowledgereported

AA-Omniscience Accuracy

SourceClaude Opus 4.6

Claude Opus 4.6

winner

45.8

Rank #23/106 · confidence 4 · eval date 2026-02-01

+19.7

Gemini 2.5 Flash

26.1

Rank #67/106 · confidence 1 · eval date 2025-06-17

Knowledgereported

Artificial Analysis Intelligence Index

SourceClaude Opus 4.6

Claude Opus 4.6

winner

26.4

Rank #57/117 · confidence 4 · eval date 2026-02-01

+12.2

Gemini 2.5 Flash

14.2

Rank #102/117 · confidence 1 · eval date 2025-06-17

Knowledgereported

AA-GPQA Diamond

SourceClaude Opus 4.6

Claude Opus 4.6

winner

84.0

Rank #67/113 · confidence 4 · eval date 2026-02-01

+15.7

Gemini 2.5 Flash

68.3

Rank #92/113 · confidence 1 · eval date 2025-06-17

Knowledgereported

AA-HLE

SourceClaude Opus 4.6

Claude Opus 4.6

winner

19.1

Rank #74/114 · confidence 4 · eval date 2026-02-01

+14.4

Gemini 2.5 Flash

4.7

Rank #98/114 · confidence 1 · eval date 2025-06-17

Multimodalreported

Design Arena Website

SourceClaude Opus 4.6

Claude Opus 4.6

winner

1306.0

Rank #14/78 · confidence 4 · eval date 2026-02-01

+179.0

Gemini 2.5 Flash

1127.0

Rank #67/78 · confidence 1 · eval date 2025-06-17

Multimodalreported

AA-MMMU-Pro

SourceClaude Opus 4.6

Claude Opus 4.6

winner

72.5

Rank #45/68 · confidence 4 · eval date 2026-02-01

+7.0

Gemini 2.5 Flash

65.5

Rank #52/68 · confidence 1 · eval date 2025-06-17

Instruction followingreported

AA-IFBench

SourceClaude Opus 4.6

Claude Opus 4.6

winner

44.6

Rank #59/84 · confidence 4 · eval date 2026-02-01

+5.6

Gemini 2.5 Flash

39.0

Rank #72/84 · confidence 1 · eval date 2025-06-17

Agentsreported

τ²-bench results

SourceClaude Opus 4.6

Claude Opus 4.6

winner

84.8

Rank #46/82 · confidence 4 · eval date 2026-02-01

+69.9

Gemini 2.5 Flash

14.9

Rank #82/82 · confidence 1 · eval date 2025-06-17

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
Claude Opus 4.6
Gemini 2.5 Flash
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
Claude Opus 4.6
Gemini 2.5 Flash
Rnglg2 API20 tests

Claude Opus 4.6

speed / latency

57 tok/s / 3926ms

input / output

No data

Gemini 2.5 Flash

speed / latency

189 tok/s / 11433ms

input / output

No data

钠 API20 tests

Claude Opus 4.6

speed / latency

42 tok/s / 2282ms

input / output

No data

Gemini 2.5 Flash

speed / latency

N/A / N/A

input / output

No data

CatClaw API10 tests

Claude Opus 4.6

speed / latency

N/A / N/A

input / output

No data

Gemini 2.5 Flash

speed / latency

54 tok/s / 10365ms

input / output

No data

ModelPool10 tests

Claude Opus 4.6

speed / latency

84 tok/s / 3916ms

input / output

No data

Gemini 2.5 Flash

speed / latency

N/A / N/A

input / output

No data

N1N10 tests

Claude Opus 4.6

speed / latency

46 tok/s / 2559ms

input / output

No data

Gemini 2.5 Flash

speed / latency

200 tok/s / 8207ms

input / output

No data

Dext API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.240/M/$1.20/M

Gemini 2.5 Flash

gemini-2.5-flash

speed / latency

No data

input / output

$0/M/$0/M

兔子API

Claude Opus 4.6

claude-opus-4-6-low

speed / latency

No data

input / output

$0/request

Gemini 2.5 Flash

gemini-2.5-flash-nothinking

speed / latency

No data

input / output

$0/request

空悲切b2b API

Claude Opus 4.6

claude-opus-4-6

speed / latency

No data

input / output

$0.258/M/$1.29/M

Gemini 2.5 Flash

[水]gemini-2.5-flash

speed / latency

No data

input / output

$0.0026/request

PoloAPI

Claude Opus 4.6

claude-opus-4-6-c

speed / latency

No data

input / output

$0.027/request

Gemini 2.5 Flash

gemini-2.5-flash-c

speed / latency

No data

input / output

$0.0027/request

柠檬API

Claude Opus 4.6

c/claude-opus-4-6

speed / latency

No data

input / output

$0.090/request

Gemini 2.5 Flash

gemini-2.5-flash

speed / latency

No data

input / output

$0.0030/request

FAQ

Weighted outcome: Claude Opus 4.6. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.