text model comparison
GPT-6 Astra vs Grok 4.7
GPT-6 Astra and Grok 4.7 are both current text models, from OpenAI and xAI. Grok 4.7 is 80% cheaper per 1M input tokens than GPT-6 Astra, $2 vs $10. On Arena Text, GPT-6 Astra scores 1475 Elo and Grok 4.7 1443 Elo (Arena, measured October 8, 2026). GPT-6 Astra has the larger context window, 1,050,000 vs 500,000 tokens.
Data verified October 13, 2026 · Dataset 2026-10-13
Side by side
Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.
| Fact | GPT-6 Astra | Grok 4.7 |
|---|---|---|
| Price per 1M input tokens | $10 | $2 (better) |
| Price per 1M output tokens | $50 | $6 (better) |
| Arena Text | 1475 Elo (#21 of 49) (better) | 1443 Elo (#37 of 49) |
| GPQA Diamond | 95.8% (#1 of 40) (better) | 92.7% (#17 of 40) |
| FrontierMath Tiers 1-3 (v2) | 93.7% (#1 of 40) (better) | 53% (#32 of 40) |
| SimpleQA Verified | 75.6% (#1 of 36) (better) | 56% (#16 of 36) |
| Provider | OpenAI | xAI |
| Release date | September 3, 2026 | September 21, 2026 |
| Access | API only | API only |
| Context window | 1,050,000 tokens | 500,000 tokens |
| Max output | 128,000 tokens | Not reported |
| Input | text, image | text |
| Output | text | text |
What each costs
Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.
| Workload or rate | GPT-6 Astra | Grok 4.7 |
|---|---|---|
| 10M input and 2M output tokens | $200 | $32 (better) |
| The same, with 9M of the input tokens cached | $119 | $18.50 (better) |
| Other listed rates | ||
| 1M input tokens, cached | $1 | $0.50 (better) |
| 1M input tokens, prompts over 200K tokens | Not listed | $4 |
| 1M output tokens, prompts over 200K tokens | Not listed | $12 |
When to choose each
GPT-6 Astra
Where it leads
- Higher Arena Text score, 1475 Elo vs 1443 Elo
- Higher GPQA Diamond score, 95.8% vs 92.7%
- Higher FrontierMath Tiers 1-3 (v2) score, 93.7% vs 53%
- Higher SimpleQA Verified score, 75.6% vs 56%
- Larger context window 1,050,000 vs 500,000 tokens
- Accepts image input
Best for
- Frontier reasoning and agentic evaluations where deep-context retrieval accuracy is the binding constraint
- Workloads that can be kept under the long-context threshold, where the effective rate stays at $10 / $50
Watch out for
- Long-context billing is a cliff, not a taper: a request over the long-context threshold is rebilled in full at $20 per million input and $75 per million output, so a prompt that crosses it costs roughly double
- GPT-6 Astra is the first publicly released model OpenAI classifies as crossing the Critical cybersecurity threshold under its own Preparedness Framework, which carries additional deployment safeguards
- Vendor-reported benchmark figures come from OpenAI’s own launch material and its own harness; they are not independently reproduced here
Grok 4.7
Where it leads
- Lower input and output prices, $2 and $6 vs $10 and $50 per 1M tokens
- Cheaper cached input, $0.50 vs $1 per 1M tokens
Best for
- Output-heavy generation under the 200,000-token prompt line
- A cheaper alternative to the frontier tiers where 500k of context is enough
Watch out for
- The long-prompt threshold is 200,000 tokens, the lowest of any model here, and reaching it doubles input and output for the entire request
- xAI's model page does not state a maximum output for Grok 4.7, so it is recorded as unknown rather than inferred
- That page does not explicitly list image input for this model either, so it is catalogued as text-only
GPT-6 Astra vs Grok 4.7 FAQ
Which is cheaper, GPT-6 Astra or Grok 4.7?
Grok 4.7 is 80% cheaper per 1M input tokens than GPT-6 Astra, $2 vs $10. For 10M input and 2M output tokens, GPT-6 Astra costs $200 and Grok 4.7 $32 at standard rates.
Which is cheaper with prompt caching, GPT-6 Astra or Grok 4.7?
GPT-6 Astra charges $1 per 1M cached input tokens, 90% below its standard input rate, and Grok 4.7 $0.50, 75% below. With 9M of 10M input tokens cached and 2M output tokens, GPT-6 Astra costs $119 and Grok 4.7 $18.50.
Which scores higher on independent benchmarks, GPT-6 Astra or Grok 4.7?
GPT-6 Astra leads on Arena Text, 1475 Elo to 1443 Elo; GPT-6 Astra leads on GPQA Diamond, 95.8% to 92.7%; GPT-6 Astra leads on FrontierMath Tiers 1-3 (v2), 93.7% to 53%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, GPT-6 Astra or Grok 4.7?
GPT-6 Astra has the larger context window, 1,050,000 vs 500,000 tokens.
How do GPT-6 Astra and Grok 4.7 differ in features?
GPT-6 Astra takes text and image input; Grok 4.7 takes text.
Articles on GPT-6 Astra and Grok 4.7
- Grok 4.7 vs Fable 5.1 vs GPT-6 Astra: Real Cost per TaskSeptember 23, 2026 · compares both
- Gemini 4 Argon Benchmarks: What Independent Tests ShowOctober 1, 2026
- Gemini 4 Pro Leaks: What's Verified and What's HypeOctober 1, 2026
- GDPval-AA Chart Fact-Check: Opus 5.5 vs GPT-6 Astra on CostSeptember 24, 2026
- Claude Opus 5.5 Benchmarks: What the Chart Shows and HidesSeptember 23, 2026
- Jev vs Fable 5.1 vs GPT-6 Astra: Which Model for Which JobSeptember 22, 2026
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Production evaluation
Choosing between GPT-6 Astra and Grok 4.7?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty