Model comparison
GPT-4o vs Llama 3.1 405B
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-4o #165 (Supported); Llama 3.1 405B #102 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-4o and Llama 3.1 405B share 11 comparable benchmark results. 0 of 8 categories are comparable. 2 results are unique to GPT-4o; 0 to Llama 3.1 405B.
Updated July 20, 2026- Shared results
- 11
- GPT-4o only
- 2
- Llama 3.1 405B only
- 0
- Comparable categories
- 0 / 8
Benchmark data for GPT-4o and Llama 3.1 405B is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
GPT-4o is priced at $2.50 input / $10.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Llama 3.1 405B.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-4o | Δ | Llama 3.1 405B |
|---|---|---|---|
| Math | GPT-4o0.3 | MarginNo overlap | Llama 3.1 405BNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-4o | Llama 3.1 405B | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-4o$2.5 input / $10 output | Llama 3.1 405B$0 input / $0 output | Llama 3.1 405B has the lower combined listed price. |
| Generation speedtokens per second | GPT-4o131 tok/s | Llama 3.1 405B29 tok/s | GPT-4o has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-4o0.81 s | Llama 3.1 405B2.19 s | GPT-4o reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-4o128K | Llama 3.1 405B128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| τ²-bench resultsSource | 25.1% | 19% | GPT-4o leads |
Coding1 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| AA-SciCodeSource | 33.3% | 29.9% | GPT-4o leads |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 11.2% | 8.5% | GPT-4o leads |
| AA-GPQA DiamondSource | 54.3% | 51.5% | GPT-4o leads |
| AA-HLESource | 3.3% | 4.2% | Llama 3.1 405B leads |
| AA-Omniscience IndexSource | -10.7% | -17.3% | GPT-4o leads |
| AA-Omniscience AccuracySource | 19.7% | 22.3% | Llama 3.1 405B leads |
| AA-Omniscience Hallucination RateSource | 37.9% | 51.0% | GPT-4o leads |
Math1 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| FrontierMath v2 (Tiers 1-3)Source | 0.345% | — | Not comparable |
Multimodal1 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 864 | — | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GPT-4o | Llama 3.1 405B | Result |
|---|---|---|---|
| AA-IFBenchSource | 34.3% | 39.0% | Llama 3.1 405B leads |
Frequently Asked Questions (3)
Can I compare GPT-4o and Llama 3.1 405B on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-4o and Llama 3.1 405B today?
GPT-4o: $2.50 input / $10.00 output per 1M tokens Llama 3.1 405B: $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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