Gemini 3.1 Pro vs
GPT-5.5

Read the published evidence, route context, and missing facts before making a local decision. This page does not name a universal winner.

Models in this comparison

Provider identity and evidence state stay balanced across the pair.

Google

Gemini 3.1 Pro

Model type: Proprietary
Evidence state: Estimated evidence
Published context: 1,000,000

OpenAI

GPT-5.5

Model type: Proprietary
Evidence state: Estimated evidence
Published context: 1,000,000

Key implications

Insufficient shared-metric coverage. Each finding is tied to a published metric, price, context, or modality fact.

Input API price: Gemini 3.1 Pro has the lower verified rate ($2 / 1M tokens vs $5 / 1M tokens).
Output API price: Gemini 3.1 Pro has the lower verified rate ($12 / 1M tokens vs $30 / 1M tokens).

Shared metric view

A radar is shown only when at least four compatible supported score metrics are published.

Comparable metric detail

AgenticGemini 3.1 Pro: 33.84 · GPT-5.5: 64.71
CodingGemini 3.1 Pro: 49.3 · GPT-5.5: 72.5
KnowledgeGemini 3.1 Pro: 66.7 · GPT-5.5: 77.7
MathGemini 3.1 Pro: 55.1 · GPT-5.5: 71.1
MultimodalGroundedGemini 3.1 Pro: 76.8 · GPT-5.5: 65.3
ReasoningGemini 3.1 Pro: 72.4 · GPT-5.5: 79
OverallGemini 3.1 Pro: 56.25 · GPT-5.5: 72.92

Source metrics

Friendly metric names and published units stay visible. Missing measurements remain unavailable rather than becoming a score.

Source metric comparison
Metric	Unit	Gemini 3.1 Pro	GPT-5.5
Agentic	score	33.84	64.71
Coding	score	49.3	72.5
Knowledge	score	66.7	77.7
Math	score	55.1	71.1
MultimodalGrounded	score	76.8	65.3
Reasoning	score	72.4	79
Overall	score	56.25	72.92

Agentic

Unit: score
Gemini 3.1 Pro: 33.84
GPT-5.5: 64.71

Coding

Unit: score
Gemini 3.1 Pro: 49.3
GPT-5.5: 72.5

Knowledge

Unit: score
Gemini 3.1 Pro: 66.7
GPT-5.5: 77.7

Math

Unit: score
Gemini 3.1 Pro: 55.1
GPT-5.5: 71.1

MultimodalGrounded

Unit: score
Gemini 3.1 Pro: 76.8
GPT-5.5: 65.3

Reasoning

Unit: score
Gemini 3.1 Pro: 72.4
GPT-5.5: 79

Overall

Unit: score
Gemini 3.1 Pro: 56.25
GPT-5.5: 72.92

Pricing and context

Verification is shown beside each selected route. Missing facts remain Not verified.

Gemini 3.1 Pro pricing routePrimary sourceGPT-5.5 pricing routePrimary source

Route pricing and context comparison
Field	Unit	Gemini 3.1 Pro	GPT-5.5
Input API price	USD / 1M tokens	$2	$5
Cached input API price	USD / 1M tokens	$0.2	$0.5
Output API price	USD / 1M tokens	$12	$30
Route context	tokens	1,000,000	1,000,000
Input modalities	published list	Not verified	Not verified
Output modalities	published list	Not verified	Not verified

Input API price

Unit: USD / 1M tokens
Gemini 3.1 Pro: $2
GPT-5.5: $5

Cached input API price

Unit: USD / 1M tokens
Gemini 3.1 Pro: $0.2
GPT-5.5: $0.5

Output API price

Unit: USD / 1M tokens
Gemini 3.1 Pro: $12
GPT-5.5: $30

Route context

Unit: tokens
Gemini 3.1 Pro: 1,000,000
GPT-5.5: 1,000,000

Input modalities

Unit: published list
Gemini 3.1 Pro: Not verified
GPT-5.5: Not verified

Output modalities

Unit: published list
Gemini 3.1 Pro: Not verified
GPT-5.5: Not verified

Evidence provenance

Source records, route identity, timestamps, and methodology are consolidated here without declaring either model a winner.

Publication time: Aug 30, 2026, 2:15 AM UTC
Freshness: Stale — Published weekly benchmark evidence has not refreshed within 8 days.
Methodology: benchlm: benchlm_raw_composite
Model records: Gemini 3.1 Pro — source benchlm · artifact models · model gemini-3-1-pro
GPT-5.5 — source benchlm · artifact models · model gpt-5-5
Selected price routes: Gemini 3.1 Pro — route benchlm:gemini-3-1-pro · source benchlm · provider google
GPT-5.5 — route benchlm:gpt-5-5 · source benchlm · provider openai

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