AI Models · Paid vs Paid

GPT-5.5 Paid vs Gemini 3.5 Flash Paid

GPT-5.5 vs Gemini 3.5 Flash compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

GPT-5.5 — full profile ›  ·  Gemini 3.5 Flash — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose Gemini 3.5 Flash for the lower output price ($9/M vs $30/M). Choose GPT-5.5 if you need the larger 1.1M context window.

GPT-5.5 vs Gemini 3.5 Flash specs

SpecGPT-5.5Gemini 3.5 Flash
MakerOpenAIGoogle
TypeProprietaryProprietary
Context window1.1M tokens1M tokens
Input price$5/M$1.5/M
Output price$30/M$9/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityGPT-5.5Gemini 3.5 Flash
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: GPT-5.5 vs Gemini 3.5 Flash

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

Gemini 3.5 Flash delivers 3× more intelligence per dollar.
GPT-5.5
Gemini 3.5 Flash
Intelligence index
54.8
50.2
Coding index
74.9
70.1
GPQA
93.5%
92.2%
Humanity's Last Exam
44.3%
41%
Long Context Reasoning
74.3%
69.3%
SciCode
56.1%
53.1%
IFBench
75.9%
76.3%
τ²-Bench
93.9%
95.3%
τ-Bench Banking
31.3%
25.4%
Terminal-Bench
84.3%
78.7%
Terminal-Bench Hard
60.6%
40.9%
Speed
86.2 tok/s
293.7 tok/s
Latency
31.22s
12.74s
Intelligence per $
4.9
14.9

Benchmark data by Artificial Analysis.

How GPT-5.5 and Gemini 3.5 Flash score

🤝 Neck and neck on these criteria (3.1 vs 3.2 / 5).
CriterionGPT-5.5Gemini 3.5 Flash
Cost-efficiency3.03.5
Context window5.05.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

GPT-5.5 Paid

OpenAI · Proprietary

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

Gemini 3.5 Flash Paid

Google · Proprietary

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution...

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
GPT-5.4GPT-5.2GPT-5GPT-5.6 Luna Pro
Other variants tracked
Gemini 3 Flash PreviewGemini 2.5 Flash

Frequently asked questions

GPT-5.5 vs Gemini 3.5 Flash — which is cheaper?

Gemini 3.5 Flash is cheaper on output ($9/M vs $30/M).

Which has the larger context window?

GPT-5.5 offers the larger context window (1.1M tokens).

GPT-5.5 vs Gemini 3.5 Flash — which should I pick in 2026?

Choose Gemini 3.5 Flash for the lower output price ($9/M vs $30/M). Choose GPT-5.5 if you need the larger 1.1M context window.

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