vs
6:0
overall capability wins (0 ties across 6 scored). Mercury 2 leads overall.
- Reasoning4:0
- Coding1:0
- Pricing0:3
- Specs1:0
Verdict
Mercury 2 leads coding (widest gap: +11.0 on SciCode); Mercury 2 offers ~2.0x larger context (128K vs 66K); Reka Flash 3 ships open weights (Apache 2.0).
- Mercury 2 leads coding (widest gap: +11.0 on SciCode)
- Mercury 2 offers ~2.0x larger context (128K vs 66K)
- Reka Flash 3 ships open weights (Apache 2.0)
- Reka Flash 3 is ~3.0x cheaper on a blended token basis than Mercury 2
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Mercury 2
- $0.44
- Reka Flash 3
- $0.15
Reka Flash 3 is about 2.9x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
Inception Labs
Reka
Family
Other
Other
License
Proprietary
Apache 2.0
Open weights
No
Yes
Release
Sep 1, 2026
Mar 12, 2025
Knowledge cutoff
-
-
API / provider
Inception Labs
Reka
Modalities
text → text
text, image, video → text
Specs
Context window
128K
66K
Max output
-
8K
Parameters
—
21B
Pricing
Input $/1M
$0.25
$0.10
Output $/1M
$0.75
$0.20
Blended $/1M (3∶1)
$0.38
$0.13
Speed
tok/s
-
110
TTFT (s)
-
0.28
Reasoning
MMLU-Pro
—
66.9
GPQA Diamond
77.0
52.9
Humanity's Last Exam
17.1
4.4
AIME 2025
—
33.7
MATH-500
—
89.3
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
21.2
13.7
AA-LCR v1.1
43.7
—
CritPt
0.8
—
MMMU-Pro
—
—
IFBench
69.8
30.4
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
43.5
Terminal-Bench 2.1
27.3
—
Aider Polyglot
—
—
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
37.7
26.7
CursorBench
—
—
SWE-Rebench
—
—
NL2Repo-Bench
—
—
DeepSWE
—
—
WebDev Arena
1,167
—
Terminal-Bench 4.0
—
—
CursorBench 4.0
—
—
FrontierCode v1.1 (Main)
—
—
Arena
LMArena Elo
—
—
| Metric | Mercury 2 | Reka Flash 3 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Inception Labs | Reka | — |
| Family | Other | Other | — |
| License | Proprietary | Apache 2.0 | — |
| Open weights | No | Yes | — |
| Release | Sep 1, 2026 | Mar 12, 2025 | — |
| Knowledge cutoff | - | - | — |
| API / provider | Inception Labs | Reka | — |
| Modalities | text → text | text, image, video → text | — |
| Specs | |||
| Context window | 128K | 66K | A +62K |
| Max output | - | 8K | — |
| Parameters | — | 21B | — |
| Pricing | |||
| Input $/1M | $0.25 | $0.10 | B +$0.15 |
| Output $/1M | $0.75 | $0.20 | B +$0.55 |
| Blended $/1M (3∶1) | $0.38 | $0.13 | B +$0.25 |
| Speed | |||
| tok/s | - | 110 | — |
| TTFT (s) | - | 0.28 | — |
| Reasoning | |||
| MMLU-Pro | — | 66.9 | — |
| GPQA Diamond | 77.0 | 52.9 | A +24.1 pts |
| Humanity's Last Exam | 17.1 | 4.4 | A +12.7 pts |
| AIME 2025 | — | 33.7 | — |
| MATH-500 | — | 89.3 | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 21.2 | 13.7 | A +7.5 pts |
| AA-LCR v1.1 | 43.7 | — | — |
| CritPt | 0.8 | — | — |
| MMMU-Pro | — | — | — |
| IFBench | 69.8 | 30.4 | A +39.4 pts |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | 43.5 | — |
| Terminal-Bench 2.1 | 27.3 | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | 37.7 | 26.7 | A +11.0 pts |
| CursorBench | — | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | 1,167 | — | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | — | — | — |
Mercury 2
- Context
- 128K
- Parameters
- —
- Price
- $0.25 / $0.75
- Speed
- —
- Modalities
- text → text
- License
- Proprietary
Inception Labs' diffusion-based (non-autoregressive) reasoning LLM, API-only with a 128K context window and high-throughput inference on Blackwell GPUs.
Reka Flash 3
- Context
- 66K / 8K out
- Parameters
- 21B
- Price
- $0.10 / $0.20
- Speed
- 110 tok/s · 0.28s TTFT
- Modalities
- text, image, video → text
- License
- Apache 2.0
Open-weight Reka Flash 3 — multimodal video/image understanding at Flash pricing.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.