Standard Compute
Model comparison 2026

GPT-6 Astra vs Grok 4.3

GPT-6 Astra
OpenAI · Frontier · Proprietary
$22/1M · 1.1M ctx
Grok 4.3
xAI · Frontier · Proprietary
$1.63/1M · 1M ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
GPT-6 Astra
Grok 4.3
Maker
OpenAI
xAI
Blended price / 1M
$22
$1.63
Input / output
$10 in · $50 out / 1M tokens
$1.25 in · $2.50 out / 1M tokens
Context window
1.1M
1M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
9.7
8.7
Agentic Ability
9.7
8.2
Speed
6.8
8.0
Value for money
6.9
8.6
Reliability
9.3
8.4

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: GPT-6 Astra or Grok 4.3?

Updated 2026-10-13

Choose GPT-6 Astra if you want the hardest coding and research tasks in OpenAI-based stacks, where cost is secondary. Choose Grok 4.3 if you want frontier capability on a tighter budget.

In our editorial scoring, GPT-6 Astra leads in 3 of five dimensions (output quality, agentic ability and reliability), while Grok 4.3 leads in 2. On price, GPT-6 Astra runs about $22 per 1M tokens (blended) and is proprietary; Grok 4.3 is about $1.63 and proprietary.

Where GPT-6 Astra falls short
  • Five times GPT-6.1 Sol's price for a small measured gain
  • Slow: about 66 output tokens/s at max effort
Full GPT-6 Astra breakdown →
Where Grok 4.3 falls short
  • Tool-use polish behind Claude/GPT
  • Smaller ecosystem
Full Grok 4.3 breakdown →

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