Compare

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 Sonnet 5.5 vs O3
anthropic/claude-sonnet-5.5 · openai/o3
Claude Sonnet 5.5 vs Gemini 2.5 Flash
anthropic/claude-sonnet-5.5 · google/gemini-2.5-flash
GPT-6.1 Sol vs O3
openai/gpt-6.1-sol · openai/o3
GPT-6.1 Sol vs Gemini 2.5 Flash
openai/gpt-6.1-sol · google/gemini-2.5-flash
Claude Opus 5.5 vs O3
anthropic/claude-opus-5.5 · openai/o3
Claude Opus 5.5 vs Gemini 2.5 Flash
anthropic/claude-opus-5.5 · google/gemini-2.5-flash
Grok 4.7 vs O3
xai/grok-4.7 · openai/o3
Grok 4.7 vs Gemini 2.5 Flash
xai/grok-4.7 · google/gemini-2.5-flash
Glm-5.3 vs O3
zai-org/glm-5.3 · 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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