vs
0:1
overall capability wins (0 ties across 1 scored). Palmyra X5 leads overall.
- Pricing3:0
- Specs0:1
Verdict
Palmyra X5 offers ~7.8x larger context (1M vs 128K); Mercury 2 is ~5.2x cheaper on a blended token basis than Palmyra X5.
- Palmyra X5 offers ~7.8x larger context (1M vs 128K)
- Mercury 2 is ~5.2x cheaper on a blended token basis than Palmyra X5
Cost for 1M in + 250K out
Illustrative chat workload at primary-provider list prices.
- Mercury 2
- $0.44
- Palmyra X5
- $2.10
Mercury 2 is about 4.8x cheaper on this workload.
Price per 1M tokens
Full comparison
Organization
Inception Labs
Writer
Family
Other
Other
License
Proprietary
Proprietary
Open weights
No
No
Release
Sep 1, 2026
Apr 28, 2025
Knowledge cutoff
-
-
API / provider
Inception Labs
Writer
Modalities
text → text
text, image → text
Specs
Context window
128K
1M
Max output
-
8K
Parameters
—
—
Pricing
Input $/1M
$0.25
$0.60
Output $/1M
$0.75
$6
Blended $/1M (3∶1)
$0.38
$1.95
Speed
tok/s
-
85
TTFT (s)
-
0.3
Reasoning
MMLU-Pro
—
—
GPQA Diamond
77.0
—
Humanity's Last Exam
17.1
—
AIME 2025
—
—
MATH-500
—
—
Humanity's Last Exam (with tools)
—
—
AA-Omniscience Accuracy
21.2
—
AA-LCR v1.1
43.7
—
CritPt
0.8
—
MMMU-Pro
—
—
IFBench
69.8
—
Chartography
—
—
Chartography (With Tools)
—
—
Coding
SWE-bench Verified
—
—
SWE-bench Pro
—
—
SWE-bench Multilingual
—
—
LiveCodeBench
—
—
Terminal-Bench 2.1
27.3
—
Aider Polyglot
—
—
Terminal-Bench 3
—
—
BigCodeBench
—
—
SciCode
37.7
—
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 | Palmyra X5 | Delta |
|---|---|---|---|
| Identity | |||
| Organization | Inception Labs | Writer | — |
| Family | Other | Other | — |
| License | Proprietary | Proprietary | — |
| Open weights | No | No | — |
| Release | Sep 1, 2026 | Apr 28, 2025 | — |
| Knowledge cutoff | - | - | — |
| API / provider | Inception Labs | Writer | — |
| Modalities | text → text | text, image → text | — |
| Specs | |||
| Context window | 128K | 1M | B +872K |
| Max output | - | 8K | — |
| Parameters | — | — | — |
| Pricing | |||
| Input $/1M | $0.25 | $0.60 | A +$0.35 |
| Output $/1M | $0.75 | $6 | A +$5.25 |
| Blended $/1M (3∶1) | $0.38 | $1.95 | A +$1.57 |
| Speed | |||
| tok/s | - | 85 | — |
| TTFT (s) | - | 0.3 | — |
| Reasoning | |||
| MMLU-Pro | — | — | — |
| GPQA Diamond | 77.0 | — | — |
| Humanity's Last Exam | 17.1 | — | — |
| AIME 2025 | — | — | — |
| MATH-500 | — | — | — |
| Humanity's Last Exam (with tools) | — | — | — |
| AA-Omniscience Accuracy | 21.2 | — | — |
| AA-LCR v1.1 | 43.7 | — | — |
| CritPt | 0.8 | — | — |
| MMMU-Pro | — | — | — |
| IFBench | 69.8 | — | — |
| Chartography | — | — | — |
| Chartography (With Tools) | — | — | — |
| Coding | |||
| SWE-bench Verified | — | — | — |
| SWE-bench Pro | — | — | — |
| SWE-bench Multilingual | — | — | — |
| LiveCodeBench | — | — | — |
| Terminal-Bench 2.1 | 27.3 | — | — |
| Aider Polyglot | — | — | — |
| Terminal-Bench 3 | — | — | — |
| BigCodeBench | — | — | — |
| SciCode | 37.7 | — | — |
| CursorBench | — | — | — |
| SWE-Rebench | — | — | — |
| NL2Repo-Bench | — | — | — |
| DeepSWE | — | — | — |
| WebDev Arena | 1,167 | — | — |
| Terminal-Bench 4.0 | — | — | — |
| CursorBench 4.0 | — | — | — |
| FrontierCode v1.1 (Main) | — | — | — |
| Arena | |||
| LMArena Elo | — | — | — |
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.
Palmyra X5
- Context
- 1M / 8K out
- Parameters
- —
- Price
- $0.60 / $6
- Speed
- 85 tok/s · 0.3s TTFT
- Modalities
- text, image → text
- License
- Proprietary
Writer's 1M-context enterprise agent model — sub-second tool calls and adaptive reasoning for long-document workflows.
Benchmark charts
Winner bars are emphasized. Per-benchmark deltas sit above each chart.
These two models have no overlapping published benchmarks in our dataset. Compare specs and pricing instead.