AI model comparison
Reka Flash 3 vs Phi 4
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
rekaai
Reka Flash 3
Reka Flash 3 is a general-purpose, instruction-tuned large language model with 21 billion parameters, developed by Reka. It excels at general chat, coding tasks, instruction-following, and function calling.
- Input / 1M
- $0.10
- Output / 1M
- $0.20
- Context
- 66K
Microsoft
Phi 4
[Microsoft Research](/microsoft) Phi-4 is designed to perform well in complex reasoning tasks and can operate efficiently in situations with limited memory or where quick responses are needed.
- Input / 1M
- $0.07
- Output / 1M
- $0.14
- Context
- 16K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Phi 4
1.4x cheaper for a typical chat
Higher intelligence score
Reka Flash 3
6.4 vs 5.9 on Artificial Analysis
Larger context window
Reka Flash 3
66K vs 16K tokens
Newer release
Reka Flash 3
Released March 12, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Reka Flash 36.4Coding index
Reka Flash 3Not availableAgentic index
Reka Flash 3Not availablePricing
Reka Flash 3 vs Phi 4 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Reka Flash 3 | |
|---|---|---|
| Input tokensPer 1M tokens | $0.10 | $0.07 |
| Output tokensPer 1M tokens | $0.20 | $0.14 |
| Cached input (read)Per 1M tokens | Not available | Not available |
| Cache writePer 1M tokens | Not available | Not available |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Reka Flash 3$0.30Coding task
30K in, 4K out
Reka Flash 3$3.80Long document summary
150K in, 2K out
Reka Flash 3$15.40Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Reka Flash 3 | |
|---|---|---|
| Context window | 66K tokens | 16K tokens |
| Max output | 59K tokens | 15K tokens |
| Input types | Text | Text |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | March 12, 2025 | January 10, 2025 |
Features
Supported features
API features available for each model.
| Metric | Reka Flash 3 | |
|---|---|---|
| Tool calling | Not supported | Not supported |
| Structured outputs | Supported | Supported |
| JSON mode | Not supported | Supported |
| Reasoning | Supported | Not supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Our take
Phi 4 is 1.4x cheaper for a typical chat. Reka Flash 3 scores higher on the Artificial Analysis Intelligence Index (6.4 vs 5.9). Reka Flash 3 has the larger context window (66K vs 16K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Reka Flash 3 or Phi 4 cheaper?
Phi 4 is cheaper for a typical chat (2K input tokens and 500 output tokens). Phi 4 costs $0.07 per 1M input tokens and $0.14 per 1M output tokens, while Reka Flash 3 costs $0.10 per 1M input tokens and $0.20 per 1M output tokens.
Which has a bigger context window, Reka Flash 3 or Phi 4?
Reka Flash 3 supports up to 66K tokens of context, compared with 16K for Phi 4.
Is Reka Flash 3 smarter than Phi 4?
On the Artificial Analysis Intelligence Index, Reka Flash 3 scores 6.4 and Phi 4 scores 5.9, putting Reka Flash 3 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Reka Flash 3 and Phi 4 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Reka Flash 3 and Phi 4 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Reka Flash 3 and Phi 4 at the same time. Compare the answers side by side and keep the best one.