Model Comparison
GPT-5.6 Terra (medium)
vs. Grok 4.6 (high)
Comparing 2 AI models · 6 benchmarks · OpenAI, SpaceXAI
Recommended Pick
SpGrok 4.6 (high)10 metric winsStrongest on: Value, Output price, Blended price
Best Value
Grok 4.6 (high)
100.0 value score
66.2 reasoning / $3.00/1M
Lowest Price
GPT-5.6 Terra (medium)
$2.00/1M input price
Best Reasoning
Grok 4.6 (high)
66.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
Grok 4.6 (high)
76.8 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Grok 4.6 (high) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Speed gap
GPT-5.6 Terra (medium) generates about 1.5x as many tokens per second as Grok 4.6 (high).
Reasoning gap
Grok 4.6 (high) leads GPT-5.6 Terra (medium) by 10.5 points on reasoning.
Coding gap
Grok 4.6 (high) leads GPT-5.6 Terra (medium) by 12.1 points on coding.
Top-pick rationale
Grok 4.6 (high) wins 10 measurable categories, including Value, Output price, Blended price, Reasoning.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.6 Terra (medium)
OpenAI
TTFT
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Time
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tok/s
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Tokens
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Cost
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Grok 4.6 (high)
SpaceXAI
TTFT
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Time
—
tok/s
—
Tokens
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Cost
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Which answer was more useful?
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Full Comparison
| Metric | Op GPT-5.6 Terra (medium) | Top Pick Sp Grok 4.6 (high) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $2.00/1M | $2.00/1M |
| Output Cost | $12.00/1M | $6.00/1M |
| Blended (3:1) | $4.50/1M | $3.00/1M |
| Specifications | ||
| Organization | OpenAI | SpaceXAI |
| Release Date | Jul 9, 2026 | Aug 12, 2026 |
| Performance & Speed | ||
| Throughput | 80.6 tok/s | 53.6 tok/s |
| TTFT | 1988ms | 45246ms |
| Latency | 1988ms | 45246ms |
| Composite Indices | ||
| Value Score | 56.1 | 100.0 |
| Reasoning Score | 55.8 | 66.2 |
| Intelligence | 46.8 | 60.9 |
| Coding | 64.7 | 76.8 |
| Standard Benchmarks | ||
| GPQA | 87.2% | 94.9% |
| HLE | 33.3% | 42.9% |
| SciCode | 49.7% | 53.6% |
| LCR | 70.3% | 75.0% |
| IFBench | 62.2% | — |
| TAU-bench v2 | 72.8% | — |
Key Takeaways
GPT-5.6 Terra (medium) offers the best value at $2.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Grok 4.6 (high) has the strongest reasoning profile with a 66.2 reasoning score,combining the available reasoning-heavy benchmarks.
Grok 4.6 (high) reaches a 76.8 coding index,making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GPT-5.6 Terra (medium)
- Cost-sensitive applications
- High-volume processing
Grok 4.6 (high)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
