The AI arena is free today

Open Superagent

Gemini 4 Carbon vs GPT-6 Astra

Gemini 4 Carbon and GPT-6 Astra are closely matched at 59.0 and 57.5 on the LLM Stats Score.

Google · OpenAI · Updated for 2026

Which is better?

Gemini 4 Carbon and GPT-6 Astra are closely matched on the overall LLM Stats Score at 59.0 and 57.5.

In the 4 individual benchmarks reported for both models, Gemini 4 Carbon wins 4; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 4 Carbon

  • you value its reported benchmark strengths — it wins 4 of 4 exact shared results
  • you want the most recent training data — it shipped Oct 2026

Choose GPT-6 Astra

  • you want predictable pricing at $10.00/M input and $50.00/M output

At a glance

The differences that matter most.

Gemini 4 Carbon
Google
GPT-6 Astra
OpenAI
Core performance indexes
LLM Stats Score
59.0
#2
57.5
#4
Reasoning
54.9
#5
56.1
#3
Coding
48.1
#3
46.5
#4
Agents
46.0
#2
44.7
#3
Cost, coverage & limits
Benchmark wins
4 of 4
0 of 4
Input price
— / M
$10.00 / M
Output price
— / M
$50.00 / M
Context window
—
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Gemini 4 Carbon
GPT-6 Astra
Vision
36.0#12
41.2#3
Tool use
35.8#3
36.3#1
Multimodal
38.0#6
38.6#5
Safety
33.0#1
31.7#2
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Gemini 4 Carbon · 22 for GPT-6 Astra

4 shared

Gemini 4 Carbon outperforms in 4 benchmarks (AutomationBench, ExploitGym, SEC-bench Pro, Terminal-Bench-Science 0.1), while GPT-6 Astra is better at 0 benchmarks.

Gemini 4 Carbon significantly outperforms across most benchmarks.

Thu Oct 29 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-6 Astra specifies input context (1,050,000 tokens). Only GPT-6 Astra specifies output context (128,000 tokens).

Google
Gemini 4 Carbon
Input- tokens
Output- tokens
OpenAI
GPT-6 Astra
Input1,050,000 tokens
Output128,000 tokens
Thu Oct 29 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 4 Carbon and GPT-6 Astra support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 4 Carbon

Text
Images
Audio
Video

GPT-6 Astra

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 4 Carbon

Proprietary

Closed source

GPT-6 Astra

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 4 Carbon was released on 2026-10-28, while GPT-6 Astra was released on 2026-09-04.

Gemini 4 Carbon is 2 months newer than GPT-6 Astra.

Gemini 4 Carbon

Oct 28, 2026

1 days ago

1mo newer
GPT-6 Astra

Sep 4, 2026

1 months ago

Knowledge Cutoff

When training data ends

GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Gemini 4 Carbon's cutoff date is not specified.

We can confirm GPT-6 Astra's training data extends to 2026-04-30, but cannot make a direct comparison without Gemini 4 Carbon's cutoff date.

Gemini 4 Carbon

—

GPT-6 Astra

Apr 2026

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 4 Carbon and GPT-6 Astra side-by-side, then vote on the output you prefer.

Gemini 4 Carbon
✓ Preferred
GPT-6 Astra
Open in Playground

FAQ

Common questions about Gemini 4 Carbon vs GPT-6 Astra.

Which is better, Gemini 4 Carbon or GPT-6 Astra?

Gemini 4 Carbon and GPT-6 Astra are closely matched on the LLM Stats Score at 59.0 and 57.5. Gemini 4 Carbon is made by Google and GPT-6 Astra is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 4 Carbon compare to GPT-6 Astra in benchmarks?

Gemini 4 Carbon scores Gray Swan IPI Benchmark: 100.0%, Vending-Bench 2: 100.0%, Graphwalks BFS >128k: 96.2%, WebDev Arena: 88.4%, SEC-bench Pro: 88.2%. GPT-6 Astra scores ExploitBench: 100.0%, ARC-AGI-3: 99.9%, ARC-AGI: 98.5%, FrontierMath Tier 4 (v2): 97.6%, GPQA: 96.0%.

What are the context window sizes for Gemini 4 Carbon and GPT-6 Astra?

Gemini 4 Carbon supports an unknown number of tokens and GPT-6 Astra supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 4 Carbon and GPT-6 Astra?

Key differences include LLM Stats Score (59.0 vs 57.5). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 4 Carbon and GPT-6 Astra?

Gemini 4 Carbon is developed by Google and GPT-6 Astra is developed by OpenAI.

Related comparisons