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Gemini 2.5 Flash vs O3

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Gemini 2.5 Flash
google/gemini-2.5-flash
O3
openai/o3
Provider
Google
OpenAI
Family
o-series
Modality
text
text
Context window
1,000,000 tok
200,000 tok
Max output
8,192 tok
100,000 tok
Released
2026-05-22
2026-05-22
License
Proprietary
Open-weight
Input price
$0.300 /1M
$2.00 /1M
Output price
$2.50 /1M
$8.00 /1M
Tools
Streaming
yes
yes
Vision
yes
JSON mode
Reasoning
Prompt caching
Batch API
Try it
Open in playground →
Open in playground →
Gemini 2.5 Flash
google/gemini-2.5-flash
Full spec →

Google's fast multimodal Gemini 2.5 model with strong reasoning and a 1M token context window.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows
O3
openai/o3
Full spec →

o3 is OpenAI’s general-purpose reasoning model, balancing strong analytical performance with reasonable latency and cost.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

Claude Opus 4.8 vs O3
anthropic/claude-opus-4.8 · openai/o3
Claude Opus 4.8 vs Gemini 2.5 Flash
anthropic/claude-opus-4.8 · google/gemini-2.5-flash
DeepSeek V4 Pro vs O3
deepseek/deepseek-v4-pro · openai/o3
DeepSeek V4 Pro vs Gemini 2.5 Flash
deepseek/deepseek-v4-pro · google/gemini-2.5-flash
MiniMax M3 vs O3
minimax/m3 · openai/o3
MiniMax M3 vs Gemini 2.5 Flash
minimax/m3 · google/gemini-2.5-flash
Gemini 3.1 Pro vs O3
google/gemini-3.1-pro · openai/o3
Gemini 3.1 Pro vs Gemini 2.5 Flash
google/gemini-3.1-pro · google/gemini-2.5-flash
Claude Sonnet 4.6 vs O3
anthropic/claude-sonnet-4.6 · openai/o3
SWITCH BETWEEN THEM

One key, all 2, one line different.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.aigateway.sh/v1",
    api_key="sk-aig-...",
)

# Gemini 2.5 Flash
client.chat.completions.create(
    model="google/gemini-2.5-flash",
    messages=[{"role":"user","content":"hello"}],
)

# O3
client.chat.completions.create(
    model="openai/o3",
    messages=[{"role":"user","content":"hello"}],
)
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