# CharXiv Extended — Mercor evaluation (CharXiv Extended (Mercor))

> Answering descriptive and reasoning questions about research-paper charts. This table shows Mercor-run configurations for reference and is excluded from model rankings.

Canonical page: https://benchlm.ai/benchmarks/mercorcharxivextended

- Category: [Multimodal & Grounded](/multimodal-grounded)
- Last updated: October 15, 2026 capture

Evaluation results published by [Mercor](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/). Published evaluation aggregates only; task contents and dataset license grants are not included.

We captured Mercor's CharXiv Extended results on October 15, 2026. The table preserves 39 published configurations, their source identifiers, reasoning settings, and disclosed pass@1 values. These are results from Mercor's evaluation setup; we did not rerun them.

The headline uses the 150 Mercor-built tasks. The paired original-set values refer to the separately listed 5000-task public benchmark. Missing baselines remain unreported. We keep the extension and original set separate from their upstream benchmark-owner and provider-run tables.

The headline is the source page's selected Pass@1 metric. The task set, harness, tools, and grader belong to this Mercor run and may differ from another evaluator's results.

The row labels retain published error margins and sample counts when supplied. Missing margins and counts remain unreported; a sample count is not used to reconstruct a task denominator. Except where the dedicated source defines an interval, the confidence level is unreported. Equal displayed scores and overlapping margins do not establish statistical ties. Capture time does not establish individual evaluation dates.

The general methodology lists llm-as-a-judge (lmaaj) and a judge of Gemini 3.5 Flash. Its run-count label is k = 3. Those notes describe the original public benchmark; extension-specific changes are not established by that reference.

- [Mercor CharXiv Extended results](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/)
- [Mercor APEX benchmark index](https://www.mercor.com/apex/)
- [Mercor methodology](https://www.mercor.com/apex/methodology/)
- [Paired Mercor original-set results](https://www.mercor.com/apex/oss-benchmarks/oss-charxiv-leaderboard/)
- [Source paper](https://arxiv.org/abs/2406.18521)
- [Upstream evaluation code](https://github.com/princeton-nlp/CharXiv)
- [Upstream dataset](https://huggingface.co/datasets/princeton-nlp/CharXiv)

## About CharXiv Extended (Mercor)

- Tasks: 150 Mercor tasks; 5000 tasks in the separately reported original set
- Format: Pass@1
- Difficulty: Source-specific evaluation
- Paper: [CharXiv Extended evaluation results](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/)

The selected headline is Pass@1. Source model identifiers, effort settings, published margins, and reported sample counts remain attached to the source configuration. Public-set results and Mercor task extensions occupy separate tables.

CharXiv Extended (Mercor) is currently displayed on BenchLM for reference, but it is excluded from the weighted scoring formula.

## Leaderboard (39 configurations)

| Rank | Model | Configuration | Creator | Score |
|------|-------|---------------|---------|-------|
| 1 | [Muse Spark 1.2](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±4.6 · Original set 95.3% ±0.5 · 450 reported samples | Meta | 87.10% |
| 2 | [Muse Spark 1.1](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±5 · Original set 95.2% ±0.5 · 450 reported samples | Meta | 86.40% |
| 3 | [GPT-6 Astra](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±5.4 · Original set 95.8% ±0.5 · 450 reported samples | OpenAI | 85.10% |
| 4 | [GPT-6.1 Sol](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.4 · Original set 96% ±0.5 · 450 reported samples | OpenAI | 85.10% |
| 5 | [Opus 5.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.4 · Original set 96.4% ±0.5 · 450 reported samples | Anthropic | 84.70% |
| 6 | [Sonnet 5.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.7 · Original set 96.1% ±0.5 · 450 reported samples | Anthropic | 84.20% |
| 7 | [GPT-6 Astra](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.7 · Original set 96.1% ±0.5 · 450 reported samples | OpenAI | 84.00% |
| 8 | [GPT-6 Sol](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.6 · Original set 95% ±0.6 · 450 reported samples | OpenAI | 83.80% |
| 9 | [Qwen3.8-Max](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±5.9 · Original set 94.1% ±0.6 · 450 reported samples | Alibaba | 82.90% |
| 10 | [GPT-5.6 Sol (Pro)](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.8 · Original set 92.1% ±0.6 · 450 reported samples | OpenAI | 82.90% |
| 11 | [Haiku 5.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.8 · Original set 94.1% ±0.6 · 450 reported samples | Anthropic | 82.90% |
| 12 | [GPT-5.4](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±5.6 · Original set 93.4% ±0.6 · 450 reported samples | OpenAI | 82.70% |
| 13 | [GPT-5.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±5.6 · Original set 94.6% ±0.6 · 450 reported samples | OpenAI | 82.70% |
| 14 | [Fable 5.1](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.9 · Original set 95.1% ±0.6 · 450 reported samples | Anthropic | 82.20% |
| 15 | [Fable 5.1](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±5.9 · Original set 94.1% ±0.6 · 450 reported samples | Anthropic | 82.00% |
| 16 | [Muse Spark 1.3](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.9 · Original set 93.9% ±0.6 · 450 reported samples | Meta | 81.80% |
| 17 | [Gemini 3.5 Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±5.7 · Original set 94.3% ±0.6 · 450 reported samples | Google | 81.30% |
| 18 | [GPT-5.6 Terra](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.8 · Original set 94.1% ±0.6 · 450 reported samples | OpenAI | 81.10% |
| 19 | [Fable 5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.1 · Original set 89.1% ±0.8 · 449 reported samples | Anthropic | 80.70% |
| 20 | [Opus 5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.9 · Original set 94.6% ±0.6 · 450 reported samples | Anthropic | 79.80% |
| 21 | [Gemini 3.7 Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.1 · Original set 95.3% ±0.5 · 450 reported samples | Google | 79.10% |
| 22 | [Gemini 3.8 Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.1 · Original set 95.4% ±0.5 · 450 reported samples | Google | 78.90% |
| 23 | [GPT-5.6 Luna](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.1 · Original set 92.9% ±0.6 · 450 reported samples | OpenAI | 78.70% |
| 24 | [Kimi K3](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±5.9 · Original set 93.9% ±0.6 · 450 reported samples | Kimi | 78.70% |
| 25 | [Gemini 3.6 Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6 · Original set 95.1% ±0.6 · 450 reported samples | Google | 78.40% |
| 26 | [Grok 4.7](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±6 · Original set 92% ±0.7 · 447 reported samples | xAI | 78.20% |
| 27 | [Grok 4.6](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · xhigh reasoning · Published margin ±6.2 · Original set 92.9% ±0.6 · 450 reported samples | xAI | 77.30% |
| 28 | [Gemini 3.1 Pro](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.1 · Original set 94.6% ±0.6 · 450 reported samples | Google | 76.90% |
| 29 | [Opus 4.8](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.4 · Original set 93.2% ±0.6 · 450 reported samples | Anthropic | 76.70% |
| 30 | [GPT-6 Luna](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.1 · Original set 90.9% ±0.7 · 450 reported samples | OpenAI | 76.40% |
| 31 | [Qwen3.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · Published margin ±6.1 · Original set 91.6% ±0.7 · 450 reported samples | Alibaba | 76.20% |
| 32 | [GLM-5.3-Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6 · Original set 92.5% ±0.7 · 450 reported samples | Zhipu | 76.20% |
| 33 | [Opus 4.7](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.4 · Original set 92.6% ±0.7 · 450 reported samples | Anthropic | 76.00% |
| 34 | [Grok 4.5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.6 · Original set 92.8% ±0.7 · 450 reported samples | xAI | 72.70% |
| 35 | [Sonnet 5](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.6 · Original set 88.8% ±0.7 · 450 reported samples | Anthropic | 71.10% |
| 36 | [Inkling](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.8 · Original set 88.9% ±0.8 · 450 reported samples | Thinking Machines | 69.80% |
| 37 | [DeepSeek-V4.1-Flash](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · max reasoning · Published margin ±6.4 · Original set 90.1% ±0.7 · 450 reported samples | DeepSeek | 68.90% |
| 38 | [Sonnet 4.6](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±7.2 · Original set 90.5% ±0.8 · 450 reported samples | Anthropic | 64.40% |
| 39 | [MiniMax-M3](https://www.mercor.com/apex/mercor-extended/ots-held-out-charxiv-leaderboard/) | Mercor extended-set run · high reasoning · Published margin ±6.7 · Original set 85.9% ±0.8 · 450 reported samples | MiniMax | 58.40% |

## FAQ

### What does CharXiv Extended (Mercor) measure?

Answering descriptive and reasoning questions about research-paper charts. This table shows Mercor-run configurations for reference and is excluded from model rankings.

### Which model leads the published CharXiv Extended (Mercor) snapshot?

Muse Spark 1.2 currently leads the published CharXiv Extended (Mercor) snapshot with a score of 87.10%.

### How many models are evaluated on CharXiv Extended (Mercor)?

The October 15, 2026 capture contains 39 source configurations.

### Does CharXiv Extended (Mercor) affect BenchLM's overall score?

Not directly. CharXiv Extended (Mercor) is still displayed on BenchLM for reference, but it is excluded from the weighted scoring formula.