Claude Haiku 5.5 vs GPT-6.1 Sol: pricing and benchmarks
Claude Haiku 5.5 is 95% cheaper on input tokens ($0.10 vs $2.00 per 1M). Claude Haiku 5.5 is 95% cheaper on output tokens ($0.50 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 5.5 costs $55.00 a month versus $1,100 for GPT-6.1 Sol, 95% less. GPT-6.1 Sol scores 166.3 on the Epoch Capabilities Index vs 159.0 for Claude Haiku 5.5.
Prices verified October 17, 2026.
Which should you choose?
GPT-6.1 Sol scores 166.3 on the Epoch Capabilities Index vs 159.0 for Claude Haiku 5.5.
GPT-6.1 Sol scores 93.7% on FrontierMath (Tiers 1–3) vs 75.1% for Claude Haiku 5.5.
Claude Haiku 5.5 costs $0.20 per 1M tokens (3:1 input-to-output mix) vs $4.00 for GPT-6.1 Sol, 95% less.
A trade-off: GPT-6.1 Sol is 7.3 ECI points more capable but costs 20.0x as much as Claude Haiku 5.5.
Pricing and specs
| Claude Haiku 5.5 | GPT-6.1 Sol | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| API model ID | claude-haiku-5-5 | gpt-6.1-sol |
| Input / 1M tokens | $0.10 | $2.00 |
| Cached input / 1M tokens | $0.01 | $0.10 |
| Output / 1M tokens | $0.50 | $10.00 |
| Long-context rates | $0.50 in / $2.50 out above 100K prompt tokens | $4.00 in / $15.00 out above 272K prompt tokens |
| Context window | 1M tokens | 1.05M tokens |
| Max output | 128K tokens | 128K tokens |
| Batch discount | 50% off | 50% off |
Benchmarks
| Claude Haiku 5.5 | GPT-6.1 Sol | |
|---|---|---|
| Epoch Capabilities Index | 159.0 | 166.3 |
| GPQA Diamond· Science reasoning | 89.6% | 95.4% |
| FrontierMath (Tiers 1–3)· Advanced math | 75.1% | 93.7% |
| SimpleQA Verified· Factual accuracy | 23.8% | 73.9% |
| ARC-AGI-2· Abstract reasoning | — | 94.2% |
| DeepSWE· Coding | — | — |
| APEX-Agents· Agentic work | 56.1% | 60.0% |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Claude Haiku 5.5 | GPT-6.1 Sol | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $35.00 | $700.00 | Claude Haiku 5.5 95% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $55.00 | $1,100 | Claude Haiku 5.5 95% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $24.80 | $468.00 | Claude Haiku 5.5 95% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Haiku 5.5 vs GPT-6.1 Sol cost calculator
- $55.00/mo$0.0011 / request
- GPT-6.1 SolOpenAI$1,100/mo$0.02 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Haiku 5.5 pricing notes
Anthropic’s fastest, lowest-cost model, priced by prompt length, with a 1M-token context window.
- Prompts over 100K tokens, counting cache reads and writes, are billed at $0.50 input / $2.50 output per 1M tokens.
- Cache writes cost $0.125 (5-minute cache) or $0.20 (1-hour cache) per 1M tokens, 5x that above 100K tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
GPT-6.1 Sol pricing notes
OpenAI’s update to GPT-6 Sol, with near-Astra performance for complex work at a lower cost.
- Cached input costs $0.10 per 1M tokens, half of GPT-6 Sol’s $0.20.
- Cache writes are billed at $2.50 per 1M tokens.
- Prompts over 272K input tokens use the long-context rates.
- Fast mode costs 2x the standard rate; Flex costs half.
Frequently asked questions
- Is Claude Haiku 5.5 cheaper than GPT-6.1 Sol?
- Claude Haiku 5.5 is 95% cheaper on input tokens ($0.10 vs $2.00 per 1M). Claude Haiku 5.5 is 95% cheaper on output tokens ($0.50 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 5.5 costs $55.00 a month versus $1,100 for GPT-6.1 Sol, 95% less.
- Which is more capable, Claude Haiku 5.5 or GPT-6.1 Sol?
- GPT-6.1 Sol scores 166.3 on the Epoch Capabilities Index vs 159.0 for Claude Haiku 5.5.
- How much does Claude Haiku 5.5 cost per 1M tokens?
- Claude Haiku 5.5 costs $0.10 per 1M input tokens and $0.50 per 1M output tokens, and $0.01 per 1M cached input tokens on Anthropic’s standard tier.
- How much does GPT-6.1 Sol cost per 1M tokens?
- GPT-6.1 Sol costs $2.00 per 1M input tokens and $10.00 per 1M output tokens, and $0.10 per 1M cached input tokens on OpenAI’s standard tier.
- Which has the larger context window, Claude Haiku 5.5 or GPT-6.1 Sol?
- GPT-6.1 Sol has the larger context window: 1.05M tokens versus 1M for Claude Haiku 5.5.