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Gemini 3.1 Pro vs GPT-6 Astra

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 3.1 Pro
google/gemini-3.1-pro
GPT-6 Astra
openai/gpt-6-astra
Provider
Google
OpenAI
Family
Gemini 3
Modality
text
text
Context window
1,000,000 tok
1,050,000 tok
Max output
65,536 tok
128,000 tok
Released
2026-05-22
2026-09-10
License
Proprietary
Open-weight
Input price
$2.00 /1M
$10.00 /1M
Output price
$12.00 /1M
$50.00 /1M
Cache read
$0.200 /1M
Tools
yes
Streaming
yes
yes
Vision
yes
JSON mode
yes
Reasoning
yes
Prompt caching
yes
Batch API
Try it
Open in playground →
Open in playground →
Gemini 3.1 Pro
google/gemini-3.1-pro
Full spec →

Google's most intelligent Gemini model with improved reasoning, a medium thinking level, and a 1M token context window.

Strengths
  • 2M-token context
  • Native video + audio input
  • Cheapest long-context reasoning
Use cases
Video understandingVery long-document RAGCodebase-scale reasoning
GPT-6 Astra
openai/gpt-6-astra
Full spec →

GPT-6 Astra is OpenAI's most capable model, built for complex reasoning, coding, computer use, research, and document creation.

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

Benchmarks

Gemini 3.1 Pro
GPT-6 Astra
Long-Context
94.2
MMLU
89.6

Source: each provider's published benchmarks. Higher is better. Run an eval to compare on your own data.

Compare with another

Gemini 3.1 Pro vs Claude Opus 4.7
google/gemini-3.1-pro · anthropic/claude-opus-4.7
Gemini 3.1 Pro vs GPT-5.4
google/gemini-3.1-pro · openai/gpt-5.4
Gemini 3.1 Pro vs Claude Sonnet 4.6
google/gemini-3.1-pro · anthropic/claude-sonnet-4.6
Gemini 3.1 Pro vs Kimi-K2.7-Code
google/gemini-3.1-pro · moonshot/kimi-k2.7-code
GPT-6 Astra vs Claude Fable 5.1
openai/gpt-6-astra · anthropic/claude-fable-5.1
GPT-6 Astra vs Gemini 3.8 Flash
openai/gpt-6-astra · google/gemini-3.8-flash
GPT-6 Astra vs Claude Opus 5
openai/gpt-6-astra · anthropic/claude-opus-5
GPT-6 Astra vs Glm-5.3
openai/gpt-6-astra · zai-org/glm-5.3
GPT-6 Astra vs Grok 4.6
openai/gpt-6-astra · xai/grok-4.6
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 3.1 Pro
client.chat.completions.create(
    model="google/gemini-3.1-pro",
    messages=[{"role":"user","content":"hello"}],
)

# GPT-6 Astra
client.chat.completions.create(
    model="openai/gpt-6-astra",
    messages=[{"role":"user","content":"hello"}],
)
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