Model Comparison
Reka Flash (Sep '24)
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 8 benchmarks · Reka AI, OpenAI
Recommended Pick
Re Reka Flash (Sep '24) 7 metric wins Strongest on: Value, Input price, Output price
Best Value
Reka Flash (Sep '24)
100.0 value score
32.4 reasoning / $0.35/1M
Lowest Price
Reka Flash (Sep '24)
$0.20/1M input price
Best Reasoning
GPT-5.5 (xhigh)
66.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
59.1 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
Reka Flash (Sep '24) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Reka Flash (Sep '24) is 25x cheaper on input tokens than GPT-5.5 (xhigh).
Speed gap
Reka Flash (Sep '24) generates about 1.6x as many tokens per second as GPT-5.5 (xhigh).
Reasoning gap
GPT-5.5 (xhigh) leads Reka Flash (Sep '24) by 33.6 points on reasoning.
Top-pick rationale
Reka Flash (Sep '24) wins 7 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Reka Flash (Sep '24)
Reka AI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
GPT-5.5 (xhigh)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Top Pick Re Reka Flash (Sep '24) | Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.20/1M | $5.00/1M |
| Output Cost | $0.80/1M | $30.00/1M |
| Blended (3:1) | $0.35/1M | $11.25/1M |
| Specifications | ||
| Organization | Reka AI | OpenAI |
| Release Date | Oct 4, 2024 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 85.8 tok/s | 55.1 tok/s |
| TTFT | 1779ms | 77633ms |
| Latency | 1779ms | 77633ms |
| Composite Indices | ||
| Value Score | 100.0 | 6.3 |
| Reasoning Score | 32.4 | 66.0 |
| Intelligence | 12.0 | 60.2 |
| Coding | — | 59.1 |
| Standard Benchmarks | ||
| GPQA | — | 93.5% |
| HLE | — | 44.3% |
| MATH 500 | 52.9% | — |
| SciCode | — | 56.1% |
| LCR | — | 74.3% |
| IFBench | — | 75.9% |
| TAU-bench v2 | — | 93.9% |
| TerminalBench Hard | — | 60.6% |
Key Takeaways
Reka Flash (Sep '24) offers the best value at $0.20/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (xhigh) has the strongest reasoning profile with a 66.0 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 59.1 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
Reka Flash (Sep '24)
- Cost-sensitive applications
- High-volume processing
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
